Documents to double-check

Passport or ID - make sure its valid and not expired
Boarding pass - digital or printed, dont forget which you prefer
Travel visa or entry documents if needed, sometimes they sneak up on you
Any hotel confirmations or rental car vouchers - keep a copy somewhere safe
Travel insurance info, just in case you need it fast

Packing last-minute items

Chargers, cables, power bank - dont leave them in the hotel room
Toothbrush, toothpaste, small hygiene items - easy to forget
Snacks for the flight - something that wont melt or spill
Headphones or earplugs - lifesaver for noisy cabins
Medications or prescriptions - check you packed enough for the trip

Airport prep

Check flight status before leaving, sometimes delays happen last minute
Arrive early - at least 2 hours domestic, 3+ international if you can
Have ID and boarding pass ready - easy access saves stress
Keep liquids and gels packed according to airport rules - avoids weird stops
Wear comfortable clothes and shoes, maybe layers in case the plane is cold
Keep essentials in carry-on, like wallet, phone, and small bag for things you need fast

Extras for peace of mind

Double-check your house or apartment before leaving - lights off, locks
Let someone know your flight details
Check weather at destination, pack a light jacket if needed
Charge everything before leaving home, dont rely only on airport plugs
Relax a little, take deep breaths - you got this, flights can be smooth