[robstitt]

Adding to Ed’s post, the 220 Sqn code was ‘NR’ at the time of Fortress IIA (B-17E) deliveries in mid-1942 - 206 Sqn Fortresses were marked ‘VX’ - but was only retained until that November when squadron codes were deleted leaving just the individual aircraft letters. For service in the Azores, from October 1943, 220 Sqn aircraft received the squadron identifying number ‘2’ while co-located 206 Sqn Fortresses were marked ‘1’. The 220 Sqn code ‘ZZ’ was only applied to the three Fortress IIIs (B-17G) later in their service in the Azores by which time the squadron’s similarly-marked Liberators were replacing their Fortress IIAs and IIs (B-17Fs).

Robert