I think they changed something with the backup planes after that big patch, when i first started and i was low ranks i would get one to backup my best plane and i am sure i was using them quite a lot but now it seems like you can only use them once or maybe twice and i think they cost gold so i wouldn't bother m8, i don't use them anymore, if you want more planes each match ( i have 6 planes ready to fly each game for every country, think you can have up to 10) at the bottom of the page where you choose your planes, to the right is a tab that says "recruit crew" it does cost either Silver or Gold, think it is Silver up to 4 planes and then it is Gold after that, for instance if i wanted to add another plane to make it 7 i would need to pay 500 Gold, i paid 250 Gold i think to get my sixth plane in all countries, don't think i will go any higher maybe 6 is enough although sometimes i am out of planes with only half the round gone lol.
Yeah how the back up planes work anyways....if you get say 3 or 4...do you use them in same missions...and after u use them do you have to buy more to replace them or when u buy them you keep them..like the regular planes?