From the context it is very clear that 'flight leader' means one of the assault troops
not the pilot. In my experience no army under the sun tolerates a situation, however small and for however short a time, where a pecking order is not established

. The thinking no doubt being that while the flights may have the same objectives but what happens if the flight becomes separated form the rest? Mathematically, also, if only 2 passengers were carried in the first two lifts, the third would also have carried much the same number of men instead of 'mainly equipment'.
Interestingly, Tigre provides a breakdown of the teams, each of 25 men (1 officer, 4 NCOs [including one pioneer NCO], 20 elnlisted). Each team consisted of an officer, 4 MG teams, an anti-tank rifle, 7 pioneers with 70 T mines, 2 boxes of explosives and hand tools: 5 axes, 3 big saws, 5 hoes (I think he means spades) and 3 pickaxes (basically gear for building barricades and entrenchments - the task of the pioneers was to build a hedgehog position as soon as they landed), with the balance made up of riflemen. With the addition of 16K rounds of ammo, the amount of extra gear was considerable. I expect some additional supplies such as food were also necessary.
Each 25-man assault group arrived in three lifts by 5 planes. The first lift delivered 2 MGs and most of the pioneers with T mines (and, I presume, the group leader). The second lift, the other 2 MGs and most of the remaining riflemen. Don't know about the anti-tank rifle.
And let's not forget that not all the Storks managed to do all three lifts. A number sustained damage on landing or take-off and were given Viking funerals by their pilots. With just 5 aircraft allocated to each assault group, the loss of even one would have made a significant dent in the delivery itinerary. This must have been vectored into the calculations. No doubt the deficit could be and probably was made up by some planes doing 4 rather than 3 round trips, but this must have caused significant delay. No doubt, therefore, that as always much of the most vital equipment would have been packed into the first lift, the one most likely to be delivered complete and on time.
My best guess for internal organisation of each assualt group
• HQ: CO, NCO 2 i/c (2)
• 1st squad: NCO, 2x lmg (team leader, gunner, ammo number) (7)
• 2nd squad: NCO, 2x lmg (team leader, gunner, ammo number) (7)
• Pioneer squad: NCO, 6 pioneers (70 T mines, 2 boxes explosives, 5 axes, 3 big saws, 5 spades and 3 pickaxes) (7)
• Anti tank rifle: gunner, ammo number (2)
And based on that, division into lifts as follows:
• 1st lift: CO, 1st squad (7), 5 pioneers with T mines
• 2nd lift: 2 i/c, 2nd squad (7), AT rifle (2), equipment
• 3rd lift: 2 pioneers, balance of equipment and supplies