Why are intra-Europe flights so cheap?
We are booked into AMS and out of LHR for 10 days late April. We are looking to find a 3rd destination for the middle of the trip and had figured to just book a train to Belgium somewhere and then on to London, but I started checking airfares and you can fly to nearly any major EU city for less then $100 and then to London for the same. Some of the fares were "small" airlines like RyanAir and EasyJet but even British Airways or KLM have flights for like $50.
How are these incredible low fares possible? How do they make money?