If you are worried about the way your luggage might be handled on an airline some airports have a place where you can have your luggage wrapped in saran wrap. And still others you can be tabs to close your luggage.
If you have allergies check with the airline to see if they can adhere to your needs. It can be better to stay over a Saturday to get a better rate. And it is always best to buy early, as much as 3 weeks. Getting off the beaten track and staying in a smaller city nearby your destination may save you quite a bit.
Children between the ages of 2-11 can fly for 10% less than regular fares and some for free depending on the country and route. And traveling off the season is problem the best advise for saving all around with airfare and accommodations. So with all these opportunities it is a good idea to ask questions and look for these perks.