Not checking in online: Most airlines allow you to check in 24-48 hours ahead of time, and you’ll get early access to things like seat selection.
Not checking your flight status before leaving home: Though you might be filled with a blinding excitement, you should remember to check the status of your flight before leaving the house.
Cracking jokes at security: For some reason, when under the pressure of time and scrutiny, people feel the need to debut their first drafts of inappropriate jokes in front of security.
Wearing the wrong clothes: If you’re leaving a snowy winter to fly somewhere tropical, don’t wear your parka, boots, and sweaters to the airport.
Wearing the wrong clothes: Additionally, avoid dressing exactly for the beach weather at your destination.
Not bringing a refillable water bottle: It’s good for the environment, your own health, and your wallet, since airport water bottles are monstrously overpriced.
Not giving yourself enough time: Sure, you no longer have to arrive three hours early, but you should still arrive with time to spare.
Paying for extra baggage: If you really think you need to pack more things (which you probably don’t), don’t wait until you get to the airport to pay for a second bag.
Not having proper paperwork for your kids: Most people aren’t aware that many countries require additional paperwork when traveling with children.
Assuming you’ll find an outlet: Sure you might find an outlet in a gate far from yours, but it’s probably filled.