The impression I got was that $25K was the cost per hour per plane. I may well be wrong and my friend is a steward after all and not a logistics expert!
I'm sure that someone who knows better than both of us will come in and rubbish th opinions of "Experts"(Bar stool experts!") like us.
I've never met you BTT but I'm hoping your a rich old geezer who is checking put the figures of running a 737 and toying with the idea of starting up an airline. I'd just like to be the first to submit my resume as I am out of work. To steal a phrase that you will no doubt understand because of your name:"You can call me Susan if it makes you happy"