The B-25C is the only bomber in the game that I know of that has WEP, that you can take up in a formation. I have noticed that if you up the 25C in a formation, and you wep until it runs out, you can just hit wep again and get the full burn time for it. Actually... you can do this twice... getting the full wep time for EACH plane in the formation.
Yesterday, I wepped a formation of B25C's for over a sector... each time it cut off, I just turned it back on until each plane had used up it's wep time.
Kinda nice if you are the buff driver... but that doesnt make it right.
If the lead buff is wepping, and the drones are staying in formation, they should be wepping right along with you... therefore burning theirs at the same rate.