Check-in for scheduled services starts 2 hours before scheduled time of departure. Equally for charter flights – or earlier, if required. For Niki flights departing at 6.00 a.m. check-in is open from 4.05 a.m.
Check-in for all scheduled flights closes 30 minutes before scheduled time of departure, for most Low Cost Airlines like e.g. Ryanair, easyjet, Jet2.com 40 minutes prior to schedule.
It is the responsibility of every single passenger to be in possession of a valid travel document (including infants) which meets both the requirements of the respective airline and those of the immigration authorities at the destination.