Check-in delays (or not)
Regards to several posts here about long lines at check-in:
If you dont have bags to ckeck-in then those lines (and posts warning you about them) are moot.
Also, if you are travelling on days other than Sat-SUn, lines are significantly shorter even if you have to ckeck-in.
Have done recently curb-to-gate in 8 minutes flat for an afternoon flight. (Something I wud not even dream of at a typical US airport)
On the other hand, if you have bags to check-in and are travelling on Sat/Sun (most timeshare and AI are on weekly basis), do pay attention to posts here and arrive at airport at least 3 hours before your flight (may be even 3.5)
Cancun departure area is expensive (2 dollar bottle of water) but clean, spacious, plenty of seats, view of runway, with pleanty of choices for food and shopping. So getting lucky at check-in and being at gate an hour or 90 min before flight is not painful like most US airports. (Remember boading typically starts 45 min before departure but takes good 20-30 min as collection of mexico exit card always takes time)