Airline pricing..
I heard that some airlines plant a thing called a 'large saved object' (hope that is the correct name) like a cookie, and use it to
store your details. This enables them to quote you a higher
price when you return. I have a plugin which deletes these things, and as far as I could check the story is true.
Also some airlines will give you a higher price depending on
where in the world you seem to come from. That case occurred
to me in the past, ie local currency price changes to the same
number in ££££'s
john