Travel Synch is an independent travel assistance service that brings several parts of a trip into one place. It covers automated check-in, airport Fast Track, lounge access, flight compensation, lost-luggage support and a handful of digital travel tools.
A check-in window can open while you are asleep, in a meeting or already focused on the rest of your trip. Miss it and you may end up checking in later than planned or, with some low-cost carriers, paying an additional airport check-in fee.
Online check-in opens anywhere from 24 hours to 30 days before departure, depending on the airline. The short windows are on the airlines that charge at the desk.