> a mind blowingly dizzying number of permutations to get from A to B. Yes, but I don't think that's what most people desire to enumerate (or what the parent o

> a mind blowingly dizzying number of permutations to get from A to B. Yes, but I don't think that's what most people desire to enumerate (or what the parent of your post had in mind). A simple enumeration of the flights available and their one-way prices would be a start. My understanding (from a link in another post) is that this would be ~(1 flight) * (average number of changes to a flight's data between birth and flight) updates per second, which I think is within reason. My understanding is that airlines frustrate this by not pricing just individual flights, but giving odd discounts on round-trips and other odd combinations (such as A→B C→A) of flights, meaning you need more than just one-way prices. (There's also the fact that some airlines have like 5 or 6 different prices for a seat all on the same flight, depending on where in the plane the seat is.)