I’ve only made one trip to Europe, but I remember it well. Have also flown commercial at other times.
My list of suggestions:
**Stay hydrated. ** You keep seeing this a lot, right? Water is your friend. When flying, I try to drink 1 glass of water for every one other glass of something else. As pointed out, the air up there is dry. Also, dehydration is a risk factor for DVT, so by keeping wet you help reduce the chances of that. Also, travel is stressful, and stress makes you sweat more, even if it’s not obvious, and you need to replace that water, too.
Pee early and often. I pee before I board the plane. I pee after I get off the plane. This will also make it easier to coordinate with the flight attendants going up and down the aisles, since you won’t be desparate. Pee every chance you get, even if you don’t have to go - just empty out what’s in the tank.
Seating: Me - I like window seats. But then, I am a relatively small person and I can spend hours - literally hours - looking at the weather and landscape outside. But, for more detailed information on your assigned seat consult Seat Guru. You will find it helpful not only to pick adequate leg room, but also in avoiding lavatory odors and excessive engine noise.
**Entertainment: ** This is going to vary from person to person. I can’t sleep on an airplane so I have to do something. If there’s nothing interesting going on outside the window I enjoy good books - but nothing that requires huge amounts of brain power. Word puzzles are good. At present, my information is that both knitting needles and crochet hooks are allowed on US flights. However, I’d recommend getting a cheap, plastic, non-threatening-in-appearance tool(s) just in case the rules change before you come back, something you won’t be torn up about if it’s taken by the TSA. I don’t think they allow scissors - but call the airline and ask. Tapes, CD’s, and handheld games are options, too - but please cooperate if the FA’s ask you to turn them off during take off and landing.
Clothing: Just one word - comfortable. Whatever is most comfortable for you. Loose is good. Layers are good, too. I travel light, so I don’t take a complete change in my carry on, but I do recommend clean underwear and socks.
**Personal hygiene: ** Please shower for the benefit of your fellow passengers as well as yourself. Thank you. Wipes are good. So is that waterless handcleaner stuff. A lot of chain drug stores now have a “samples” aisle where you can get minature everything - toothpaste tubes, toobrushes, mouthwash, various other products. Get a few and put them in a ziplock baggie. Also, never go into a lavatory without a travel size package of facial tissue. (Backup toilet paper, dontchya know)
**Food: ** If it’s an international flight double-check what is and isn’t allowed through customs. Fruit, for instance, frequently is not allowed across borders. When in doubt take something sealed in a bag or bottle. Always good to carry food and water on a trip because you never know when there will be delays.
Stress: As I mentioned, there’s a certain amount of stress involved in travel of any sort. Try to get some extra rest and eat well the three or four days before your trip - this will put your body in the best condition for a trip. If it’s a choice between good food and good rest go for the food - if you’re tired enough you’ll sleep on the airplane. Allow LOTS of time for everything - arrive early whenever possible. Be patient If there’s a delay the only choices you have are to be late and angry, or late and calm. I prefer the latter. Always have a Plan B - that’s what all those recommendations about carry copies of your documents are about, having entertainment with you, snacks with you, a change of clothing are all about. Stuff happens when you travel. If you’re prepared to deal with potential problems and they don’t happen, no harm done. If they do happen, you’re ready to deal with them. It will still be stressful, but less so than otherwise.
**Have fun. ** That’s why you’re going, right? Take pictures, enjoy the scenery, buy a few souvenirs. On the way back, if you’ve picked up a lot of goodies, you might consider mailing or shipping them to yourself back home so you’re not overloaded. Where I work we have some veteran road warriors who take almost nothing on the airplane with them - they actually ship their work stuff to their hotel, then ship it back.