Check-in: What is “Online Check-in”?
Most airlines offer you the possibility to pre-arrange check-in and seating online from their websites. This can normally be done from between 24-48 hours before a departure so you should check the relevant airline(s) when they open up for online check-in.
We recommend you to use the airline's online check-in options when available. If you do not check-in online and wait until the airport, you may not be seated together with your travel companion(s).
Note that the 'operating airline' might be different than the 'marketing airline' in which case you should go to the 'operating airline' for online check-in. You should also note that the 'reference' sometimes required by the airline is not your 'KILROY reference' but the airline reference you find in your online itinerary at www.tripcase.com.