The standard British Quick Reaction Alert intercept, in the Cold War era, went something like this. NATO radar would call out an unidentified contact entering the United Kingdom Air Defence Region. Two RAF Phantom FGR.2s would be airborne in under five minutes. They would close on the contact, identify it visually, photograph it, and shadow it until it left British airspace. The contact would almost always be a Soviet Tu-95 Bear bomber. Both sides would log the encounter in their respective files. Everybody went home.

Once in a while, however, the contact wasn’t what it seemed.

One former RAF Phantom pilot has recounted, decades after the event, an interception of a four-engined airliner with Aeroflot markings — an Ilyushin Il-62 — that turned out to be something rather different. The civil-aviation paint job was, as the pilot’s photograph would later confirm, a cover.

Why airliners flew where airliners shouldn’t

The Soviet Union, like every other major power during the Cold War, used its national airline as a cover for intelligence collection. Aeroflot’s flag-carrier flights to Western capitals were, on paper, civilian operations. In practice, a meaningful fraction of them carried KGB and GRU officers, deviated subtly from filed flight plans to overfly things they shouldn’t, and occasionally flew aircraft that were, structurally, far more than the brochure suggested.

The Il-62 was a long-range four-engined airliner — the Soviet rough equivalent of the Boeing 707 or the VC10 — and it was the workhorse of Aeroflot’s intercontinental fleet. By the standards of the day it was a perfectly civilised passenger aircraft. It also had, in certain examples, internal volume and electrical capacity that could be used for things other than carrying tourists. Some Il-62s were configured with reconnaissance equipment, signals-intelligence gear, and modified communication systems that civilian airliners did not need.

The intercept

The story, as it has been told, goes like this. RAF Quick Reaction Alert was scrambled when a target was detected approaching the UK Air Defence Region from the north — the standard ingress route for Soviet aircraft heading from the Murmansk area down toward the Atlantic. The two Phantoms went supersonic for a chunk of their intercept, levelled off at around 35,000 feet, and closed on the contact.

The pilot, on visual identification, found himself looking at an Aeroflot Il-62 in fully civilian livery. That was unusual but not unprecedented. Aeroflot did fly Il-62s to and from London Heathrow and other Western hubs. The catch, in this case, was that the aircraft was flying a heading and an altitude profile that did not match any filed civilian flight plan. It was, in plain terms, where it shouldn’t have been.

The Phantom pilot did what he was trained to do. He took up station off the Il-62’s port wing, took photographs, and called in the contact. The Aeroflot crew waved at him through the cockpit window. The Il-62 did not deviate from its flight path. The Phantom shadowed it until the airliner exited UK airspace heading east, presumably home to the Soviet Union, and broke off the intercept.

Why the Aeroflot livery mattered

The reason this kind of mission existed was a quirk of Cold War rules of engagement. Western air-defence pilots could legally engage a clearly military Soviet aircraft that violated their airspace. They could not, without enormous political risk, shoot down an aircraft in civilian markings carrying paying passengers. The Aeroflot livery was, in effect, a passive defence against missiles. As long as the Il-62 looked like an airliner from the cockpit of a Phantom, it was safe.

The Soviets exploited this. So, for that matter, did Western intelligence — Cold War U.S. and British signals-intelligence aircraft sometimes carried civilian-airline-style markings for the same reason. The blurred line between civilian and military aviation in the late twentieth century had less to do with civilian airline expansion and more to do with both sides wanting plausible deniability when their reconnaissance aircraft got too close to someone else’s airspace.

An education in the cockpit

The pilot who tells the story has said that the lesson of the intercept stayed with him for the rest of his career. The contact you intercept is not always the contact you expect. The radio call says “unidentified”. The visual identification, when you finally pull alongside, sometimes reveals an airliner. Sometimes the airliner is exactly what it claims to be. Sometimes it is not.

Either way, you take the photographs. You stay calm. You log the encounter. And you let the analysts, somewhere in a windowless room, work out what the Soviets were really up to.

For the RAF Phantom community, the Cold War was thousands of routine intercepts and a handful of stories like this one. The Il-62 in Aeroflot paint, flying a route no airline ever filed, is one of them.

Sources: The Aviation Geek Club, RAF Historical Society, Royal Air Force Museum oral history archive.