As a
travel agent - and having also worked in reservations for an airline here are a few tips...
The further out you book - the more likely your reservations will change.. sometimes only by a few minutes - but also by HOURS.. especially if you are on an airline that only has a couple flights a day that can get you into a given city. Always stay aware of the times of the flights that can get you there.
Always make sure the AIRLINE has any phone contacts for you.. home/work/cell - also phone numbers at your destination. If you are using a travel agent, make sure they put these numbers in your record. The airline may or may not be able to see the numbers the agency puts in - but often they will call the agency if there is a last minute cancellation. I think it is better even if you have a reservation with a
travel agency to call the airline and give them the numbers. They don't always call - but you never know.
Remember that the really "cheap tickets" have massive restrictions - it will be quite costly to make any changes once you've purchased your tickets.
Pre reserved seat assignments are ALWAYS subject to change - this is probably the most misunderstood aspect of flying. I know that the most angry folks I've had to deal with are over those stinking seat assignments (made me wish I worked for SouthWest - they don't even offer seat assignments!!). See what they can do, but don't get thrown for a loop if you don't get the seat you thought. If the schedule changes - ask at that time for new seat assignments... not all reservation agents are as thoughtful as others - and may not offer to get them for you.
Plan ahead - make sure you take snacks (pretzels, cookies, apples, etc) and water/juice. If you get delayed, or missconnect on the way it comes in handy. Also - take toothbrush - ALL prescriptions, pj's, and a change of clothes (at least underwear) in a carry on - you never know when weather may delay you over night.
Always make sure you get to the airport 1 1/2 - 2 hours ahead of time for security check in. I just make sure I take a book, my son has his gameboy.. something to do. Get yourself through security, go to the gate and relax. It seems like a chunk out of your day - but it truly makes life MUCH easier.
Thousands of folks fly every day with OUT any problems at all - but it's always to your advantage to be prepared! Re reading this it looks scary - but it's really pretty easy once you get the hang of it. Just leave yourself plenty of time - and stay on top of your reservations so you know what to expect.