Purchasing trip insurance that will cover the losses.
Pack valuable, and fragile in the carry-on bags.
Always keep the eyes on the bags.
Get to know the right destination's airport code and make sure the code on your luggage claim card cope with the proper destination's.
Check your bag carefully in the luggage claims area before departing the airport.
Avoid taking luggage with flashy brand names, as it will make them more attractive to thieves.
Use the locks on your luggage.
Clearly label the inside and outside of the luggage.
Place a trip itinerary in the luggage so the lost bags can easily be returned.
Place a unique bright marking on the luggage for identification.
Protect your passwords when using ATM or phone card numbers.
Make a claim before leaving the airport if an airline loses the luggage.
Carry a list of all items in the carry-on and leave one at home, to help making a complete claim form if the items go missing.