A quarter of customers pay the tip, but how many of them know it? There are a number of innovative features that set Hopper apart from other online travel agencies. The fintech add-ons ...

Early this year, U.S. travel companies told investors they saw no signs of slowing demand despite rising costs, but now, Hopper said, more customers are booking travel only when the price is right.

There would be puts and takes involved in any Hopper IPO. Its youthful audience and fintech products are advantages. But what would happen if Expedia decided to remove its hotel supply again?