When you go onto the TC site and you put in the departure airport and the arrival airport, it asks you if you would consider 'other airports. If you say yes, it will give you the flight options for other departure and arrival airports. This is how I came to be flying from Edinburgh and returning to Glasgow, which was perfect for me and through doing this, I saved a fortune. Thomas Cook are operating the outward flight which is Pegasus whilst on the return, it is their own aircraft. Hope this helps.