Quick Reaction Alert (QRA) is the state of readiness and modus operandi of air defence maintained at all hours of the day by NATO air forces. The United States usually refers to Quick Reaction Alert as Airspace Control Alert.
Some non-NATO countries maintain a QRA, either full-time or part-time.Fiona Lombardi; The Swiss Air Power: Wherefrom? Whereto?, vdf Hochschulverlag AG, 2007, Page 95.Swiss Air PowerGeorg Mader; "Austria further reduces QRA capabilities", Air Platforms, Jane's 360, IHS, 21 August 2014.
Operation QRA in the United Kingdom There are two QRA stations in the United Kingdom, one at RAF Coningsby in the east of England, and the other at RAF Lossiemouth in Scotland.
Pilots and engineers on QRA duty are at immediate readiness twenty-four hours a day. They are fully dressed in the Crew Ready Room, which are next to the hangars, a hardened aircraft shelter known informally as Q-sheds, which houses the interceptor aircraft, since 2007 the Eurofighter Typhoon. Pilots are on QRA duty around once or twice a month, each a twenty-four-hour shift.
Engineers are on QRA duty three or four times a year, each for a twenty-four-hour a day shift, for seven days at a time. Two Typhoon aircraft are maintained at readiness, along with a Voyager tanker at RAF Brize Norton in Oxfordshire. Before 2014 this task was carried out by a TriStar.
Civilian aircraft in the UK are monitored by NATS Holdings at: Swanwick, Hampshire with the London Area Control Centre and London Terminal Control Centre (at RAF West Drayton until 2007), broadly known as the London Air Traffic Control Centre, which covers the London Flight Information Region (EGTT). The RAF have a team at Swanwick. Prestwick, which covers the Scotland Flight Information Region (EGPX) which is north of the Solway Firth.
Military radar in the UK is controlled by the UK Air Surveillance and Control System (ASACS), looked after by ASACS Force Command. It has Remote Radar Heads (RRH) at: RRH Benbecula in the Outer Hebrides RRH Saxa Vord in Shetland (AN/TPS-77 radar moved from RRH Staxton Wold) RRH Buchan (former Master Radar Station, or MRS, Buchan) off the A90 south of Peterhead RRH Brizlee Wood in Hulne Park, Northumberland (west of RAF Boulmer) RRH Staxton Wold off the B1249 in Willerby, North Yorkshire RRH Neatishead at Neatishead, Norfolk RRH Portreath in Cornwall
From 1997, the radars were the 1.1MW Plessey AR-320 (Type 93) and were replaced by the Lockheed Martin AN/FPS-117 system.
QRA in the United States The United States refers to Quick Reaction Alert as Airspace Control Alert.
QRA response A QRA response involves fighter aircraft being scrambled to investigate an infringement of a NATO country's airspace or area of interest. Air traffic across Europe is controlled by Eurocontrol in Brussels.
The command of each nation's QRA mission is handled by a NATO Combined Air Operations Centre (CAOC). As of 2026, the three CAOCs are located at: Torrejón (CAOC TJ) in Spain, which handles operations south of the Alps; Uedem (CAOC UE) in Germany, which handles operations north of the Alps; Bodø (CAOC ENBO) in Norway, which handles operations in the Nordic countries (Finland, Norway and Sweden).
The control of these missions is delegated to the respective nation's Control and Reporting Centre (CRC), which then responds directly to its assigned NATO CAOC. Thus, the aircraft on QRA duty are controlled by the national CRC, which in turn reports to and is commanded by the CAOC.
When an aircraft without a flight plan or lacking an active transponder and refusing to identify is detected by national or allied radar on the outer limit of an Air Policing Area (APA), the information, called a Recognised Air Picture (RAP), is passed via Link 16 connection by the CRC to its CAOC. The CAOC then analyses the RAP and, after deciding which fighters will be sent, issues an order for an alpha scramble (with live ordnance). Two aircraft on QRA duty, forming an element or section (two-ship formation - leader and wingman), are then launched (depending on the situation, a second element could be launched as well).
After taking off, the fighter element is directed by the national CRC. The primary mission is to "INTERCEPT" the target, designated as a BOGEY (an unidentified radar contact). As the pilots maintain continuous contact with the CRC (either by radio or through Link 16) and provide data on the target, they are ordered on how to proceed. The following tasks can be further issued: "INTERROGATE" - obtaining additional information about the target through any means (radio or visual contact); "VID" - visual identification, which is part of the "interrogate" process and involves acquiring more details about the target (aircraft type, markings, armament, etc.) either through direct visual contact or through onboard equipment; "SHADOW" - involves following the target and obtaining information about it, without being detected if possible; "ESCORT" - the fighters enter formation with the target aircraft and will either escort it until it leaves the area, or to a designated airfield for landing.
Based on the target's behaviour, the decision-makers might issue an order to engage and shoot it down, in accordance with the Rules of Engagement (ROE). The order "ENGAGE" is given as follows: if the bogey is military - in this case, the CAOC commander (COM CAOC) will issue the order. The intercepting aircraft will only engage the BANDIT (designated enemy aircraft) in self-defence; if the bogey is civilian - in this situation, if the aircraft is determined to have been hijacked, it is designated as RENEGADE and a RTOA (Reverse Transfer Of Command) will take place by which command is transferred from the CAOC to the national CRC and the order to engage is ultimately given by the CRC.
When the order to engage is given, in accordance with the ROE, the target is designated HOSTILE and the fighters are clear to engage. Within the element, the leader has the primary role in engaging while the wingman maintains formation and supports the leader.
Military aircraft from Russia could be tracked across Norway and reported to the Norwegian Joint Headquarters near Bodø, or the Combined Air Operations Centre 2 (CAOC UE) in Uedem, North Rhine-Westphalia, close to the border with the Netherlands. Combined Air Operations Centre Finderup (CAOC Finderup), in Denmark, watched Russian aircraft, could alert the UK, and had RAF staff there until its deactivation in June 2013. Since then, responsibility from Finderup was transferred to Uedem.
Russian Air Force Tupolev Tu-95 aircraft originate from the Olenya air base on the Kola Peninsula. Tupolev Tu-160 Blackjack aircraft come from the Engels-2 base near Saratov. The Tu-95 aircraft are on 12-14 hour missions, and when tracked across Norway, have been colloquially referred to with the codename of zombies.
QRA response in the United Kingdom This may also be a civilian aircraft that poses a threat, if not sufficiently responding to air traffic control (ATC). Incidents of this nature in the UK are monitored by the CRC at RAF Boulmer, which builds a 3D Recognised Air Picture. The National Air and Space Operations Centre (NASOC) at RAF Air Command, RAF High Wycombe decides whether to send a QRA response. The Joint Force Air Component Headquarters is also at High Wycombe.
QRA stations
Austria Austria has only daylight QRA readiness. Austrian Air Force Air Surveillance Command is located at Salzburg. Fighter Squadron 1 & 2 with Eurofighter Typhoon are at Zeltweg Air Base.
Baltic States Lithuania, Latvia and Estonia, though members of NATO, have no fighters capable of QRA intercepts. Other NATO nations provide periodic air defence at the NATO QRA standard as part of NATO Baltic Air Policing.
Belgium Florennes Air Base and Kleine Brogel Air Base.
Bulgaria Graf Ignatievo Air Base (3rd Fighter Air Base) of the BuAF has a single MiG-29 squadron, which carry two R-73 missiles. The Bulgarian CRC is at Sofia.
Croatia The Croatian Air Force's Air Force and Air Defence Command is located in Zagreb. The 191. Fighter Squadron, flies Dassault Rafales from Pleso (Zagreb Airport).
Czech Republic The 261st Control and Reporting Centre (CRC), is in Hlavenec. The Czech Air Force uses JAS-39C/D Gripen at Čáslav AFB.
Denmark The Royal Danish Air Force Command is headquartered at Karup Air Base. The Fighter Wing with the Eskadrille 727 and the Eskadrille 730, at Skrydstrup Air Base use F-35A Lightning II fighters.
Finland The Finnish Air Operations Centre is at Jyväskylä–Tikkakoski Air Base. The Finnish Air Force Fighter Squadron 31 (Hävittäjälentolaivue 31, HävLLv 31) uses F-18C/D from Rovaniemi and Kuopio. In addition to the Air Force's main operating bases, QRA aircraft may by rotated between civilian airports and other temporary operating bases.
Germany The municipality of Uedem houses NATO's Combined Air Operations Centre (CAOC) Uedem.
Taktisches Luftwaffengeschwader 74 provides cover in the south, and Taktisches Luftwaffengeschwader 71 "Richthofen" in the north. The German Air Force uses Eurofighter Typhoons from Wittmund (QRA North) and Neuburg Air Base (QRA South), with alternate QRA bases in Nörvenich and Rostock-Laage Airport.
Hungary The Hungarian Air Command and Control Centre is in Veszprém. The QRA base is at the Kecskemét Air Base. The Fighter Squadron Puma operates JAS-39C/D Gripen fighters. The Hungarian Gripens are responsible for the air police service over Slovenia.
Iceland Iceland, though a member of NATO, has no standing armed forces. Other NATO nations provide periodic air defence at the NATO QRA standard as part of NATO Icelandic Air Policing.
Italy Italian Air Force squadrons equipped with Typhoon and F-35 jets provide QRA coverage on a rotational basis. These squadrons are based at Grosseto Air Base in Tuscany (IX Gruppo of 4º Stormo), Gioia del Colle Air Base in Apulia (10° Gruppo and 12° Gruppo of 36º Stormo), Trapani Air Base in Sicily (18° Gruppo of 37° Stormo), and Istrana Air Base in Veneto (132° Gruppo of 51° Stormo), all of them operating Typhoons. More recently the F-35As based at Amendola Air Base in Apulia (13° Gruppo of 32° Stormo) have been given QRA tasks as well, and F-35s at Ghedi Air Base in Lombardy will be on QRA too.
Netherlands The Royal Netherlands Air Force (RNLAF) have F-35 aircraft at Volkel Air Base or Leeuwarden Air Base on high alert. They intercept once notified by the Air Operations Control Station Nieuw-Milligen, near Apeldoorn in Gelderland. The RNLAF alternates the responsibilities for QRA above Benelux with the Belgian Air Component every four months since 2016/2017.
Norway The Royal Norwegian Air Force Quick Reaction Alert force consists of two F-35s on high alert from Evenes Air Station.
Romania The Romanian CRC is at Balotești in southern Romania, near Bucharest. The Romanian Air Force operates F-16 Fighting Falcons on QRA duty, which carry AIM-9X and AIM-120C missiles. As of 2026, two squadrons are operational: (48th Fighter Squadron) at the RoAF 71st Air Base () at Câmpia Turzii in central Romania; (53rd Fighter Squadron) at the RoAF 86th Air Base () at Borcea in south-east Romania.
Slovakia The Air Force Command of the Slovak Air Force is in Zvolen. The 1st Tactical Squadron is waiting for delivery of F-16V at Sliač Air Base. Currently the Slovak airspace is guarded by German Air Force, Czech Air Force, Polish Air Force and Hungarian Air Force until the American F-16s are delivered.
Spain The Spanish Air Force and Space Force establishes a number of multipurpose fighter units that take turns among themselves. On the one hand, there are four units dependent on the Air Combat Command (MACOM) that are responsible for protecting the airspace.