In order of checking in:
Red Leader ("all wings, report in"), Red 10, Red 7, Red 3 (Biggs), Red 6 (Porkins), Red 9, Red 2 (Wedge), Red 11, Red 5 (Luke)
After Luke checks in, Red Leader tells them to "lock S-foils in attack position"
So, there is no Red 4 or Red 8.