Chris,
I fear that the Nikkor-M 300mm may be close to your best bet amongst readily available kit.
I would point out also that the wind forces of an aircraft will delight in chewing up any sort of bellows unless you are inside with the windows shut. In that case the window will negate any benefit of shooting 8x10.
Please note that I am not being defeatist in saying this but trying to fore warn some of the possible calamities that may befall you.
Bookmarks