Airport busses from Ermerkez (mall in the very centre of city)
There is a daily train (Doğu Express) from [wiki=0ef8f876d62a45352e28410454e3634b]Istanbul[/wiki]. Doğu Express calls at [wiki=9221413dd904c157938b397753a8b4bb]Ankara[/wiki], too. There is also another daily train from Ankara (Erzurum Express), which is reported to be more comfortable (and also more expensive) than Doğu Express.