With summer travel heating up, what should you do if the airline loses your luggage?
First contact the airport's lost and found department and file a lost bag claim form. Then ask about your airline's policy for replacing any essentials you don't have with you in your carry-on. If you need to replace anything, remember to keep the receipt. You may need it.
Before you leave it's a good idea to email your itinerary, flight info, hotel name and number and any other important information to yourself and to a friend you can get it touch with easily. Take photos of your passport as well as having the number easily available.
These may be common sense to you...but it doesn't hurt to be prepared.