RED Air's website allows travelers to check-in online for most flights ahead of time. 2. Passengers are required to complete web check-in no later than an hour before scheduled departure. 3. For domestic trips, flyers can check-in online from 24 hours up until the one hour cutoff. 4. International routes permit check-in through the airline's site up to two hours prior to the listed departure time. 5. After completing online check-in, passengers should print their boarding pass to present at both the security checkpoint and upon boarding the plane. 6. Those who neglect to check-in online within the mandatory one hour window will forfeit their seat and reservation, deemed a no-show. 7. All flights must meet load capacity rules to leave on time; folks failing to check-in and board during the allotted timeframe risk denied boarding.