They know that people check a flight price then they go check hotels and other details for those days, then they come back to book the flight. People also check

They know that people check a flight price then they go check hotels and other details for those days, then they come back to book the flight. People also check similar flights and those earlier or a bit later. They can see this pattern of a customer looking for the best deal. By the time you've figured everything and made up you mind to book, they know that you want to buy. This is when they increase the price. when you actually try to book. I often get flight no longer available at that price. some sites i have to start over, some offer me an increased price. here's a pattern i saw, for a flight to book 2 days ago: $775 (initial price) -> $779 -> $832 -> $895. This price ladder happened regardless of how i accessed the booking, ie through different websites. I decided i wasn't paying another 100 bucks and gave up. 24 hours (approx) later, i booked the same flight, through the same website for $785. The whole thing could be just random, but i've had this sort of thing before.