The rules for Baggage allowances and restrictions will vary depending on which airline(s) you are flying.
Due to recent fuel price increases, luggage weight limitations have been further reduced.
The best source of information about luggage limitations, security, and the cost of excess luggage is the airline on which you are traveling. Call their toll-free number or visit their website for details.
If you call, be prepared with the weight and dimensions of each piece of luggage that you wish to transport. The airline representative can provide you with approximate costs for oversized or extra pieces.
Note that charter flights have very limited luggage allowances compared to most scheduled airlines.