Hello all

I'm wondering if you know of any airlines or websites that deal with discount, last minute bookings? e.g. you show up on the day without a booking, and you only find out a few a minutes before the flight closes if they have room for you, and you pay a discounted price?

As I'm based in the UK, I would prefer one of the London airports (LHR/LGW) to fly out from, and I would want to fly to the USA (LAS or JFK, but any where), and pickup a cheapo domestic.

Thankyou