Goodevening, I am currently working on an app that compares flight/train/bus tickets to a particular destination and provides users with the cheapest option, much like Rome2Rio.com does. There are lots of ticket comparison websites out there, and I was wondering how they get access to these ticket-price 'databases'? Are there any legal issues attached to this, for example? Or is it simply a matter of writing the right code that compares the different airline websites? I'm completely in the dark on this one and would appreciate any help!