Airlines are already adopting a 'would you like fries with that?' up-selling policy – and they're looking for new ways to milk us for every last cent.
Extra fees for things like checking in bags or buying drinks on board are expected to add US$36.1 billion to the combined revenue of the world's biggest airlines this year, according to airline revenue consultant IdeaWorksCompany.
That will represent an 11.3 percent increase since 2011.
It's a lucrative business, and one the airline industry looks set to expand.
"They are understanding how to raise and lower fees to maximise overall revenue and how to better position items in the booking path to drive better sales," IdeaWorksCompany president Jay Sorensen told the LA Times.
Budget airline EasyJet is introducing paid seating this month, after years of operating a first-in, first choice policy.
Passengers will have to cough up an extra £3 ($A4.60) each for the privilege of sitting next to a friend or family member. Those who want to be first to disembark can pay £8 ($A12.28) to sit near the exits, while a seat with extra legroom will go for another £12 ($A18.40).
Business travel writer Joe Brancatelli told the Times airlines will start to get creative with new ways to boost revenue.
"The low-hanging fruit is gone," Mr Brancatelli told the LA times. "They are going to have to invent products."
He expects airlines will start by charging hefty fees for Wi-Fi in the sky, and offering to deliver travellers' luggage – for a price.