2 = pair
4 = 2 pair = flight
A squadron should be 4 flights = 16 planes (in air, more in total).
So far I think RAF and US is the same, but then comes Wing and Group where it differs.
2-3 squadrons is a Wing in RAF, but in US it’s a group. And 3-4 wings makes a group in RAF, but in US 3-4 groups makes a Wing.
Starting at the beginning of the war RAF Squadrons comprised of 16 available aircraft, but only twelve flew at any one time. This left 4 on the ground and in the hangars being worked on.
Each twelve aircraft flying consisted of two Flights A and B. Each of these flights had two sections of 3 aircraft each. A flight had Red and Blue sections while B flight had Yellow and Green sections.
Individual code letters for aircraft usually were for each flight, A flight taking the letters A through to M and B flight taking letters N through to Z.
No idea when it changed for the RAF but up until the Lean into France in 41 this was the standard practice
I think the RAF standardised on the Finger-4 some time in 1942 but it had been adopted ad-hoc prior to that. A section then became 4 aircraft composed of two pairs. Two sections became a flight and two flights a squadron.
For operational purposes, both flights of the same squadron may not have participated in the same mission unless maximum strength was required. I think the 8 aircraft formations became quite common in the run up to and after D-Day so it was possible to achieve maximum coverage by alternating flights on escort or fighter sweeps throughout the day. Maybe one section from B-Flight would operate with A-Flight if 12 rather than 8 aircraft were needed. That way some pilots are always stood down and get some rest each mission.
I recall from Clostermann that in 122 Wing two flights of 8 aircraft - not necessarily from the same squadron - would operate in parallel about 10-20 miles distant so that one could support the other if they ran in to difficulties (though he’s not always the best source for accurate info).
[QUOTE=Marsh EAF19
I recall from Clostermann that in 122 Wing two flights of 8 aircraft - not necessarily from the same squadron - would operate in parallel about 10-20 miles distant so that one could support the other if they ran in to difficulties (though he’s not always the best source for accurate info).[/QUOTE]
In modern NATO terms it would have been called a package.
Definition: Sqd working together on the same overall objective.