To enjoy a smooth JetBlue check-in experience, it's essential to know the airline's rules and timelines. Online and mobile check-in open 24 hours before departure and close 60 minutes before domestic flights and 90 minutes before international flights. Airport check-in kiosks and counters follow the same closing times. Ensure your bags are checked in before the cutoff times to avoid delays. Arriving early, having documents ready, and checking in online can significantly streamline your travel day.