Sounds totally unreasonable to me, if he wants
anything like an alternating 2 weeks then he should be the one sorting it - and get an agreement that if it is late back then you get that extra time plus the costs if you need to go to pick up the aircraft. He is the one that has changed things so why should you be paying and messing about so he can do things differently. I think everyone who has said that it could be a manageable setup thinks your partner should be the one doing all the positioning because he is the one that wants to change things - and he should still expect to pay his bills at the original base!