Our recommended arrival times are meant to allow plenty of time to check in (with or without bags) and clear security before scheduled departure.
To speed up the process, you can use curbside check-in or self-service kiosks at most airports. You can use curbside check-in if you have an electronic ticket (can scan it from your phone).
You can check-in online or from the app starting 24 hours before and up to 45 minutes before departure (90 for international).