What you can/can't pack in your luggage, and what is free and incurs a fee.
Airlines started a fee frenzy, particularly when fuel prices skyrocketed. Fuel surcharges on top of baggage fees, paying for pillows - and the thing is, even when the price of fuel came back down to earth, the fees stayed.
US based, legacy airlines
Alaska Airlines policies regarding checking strollers, car seats, mobility devices and sports equipment.
United Airlines policies regarding checking strollers, car seats, mobility devices and sports equipment.
Delta's policies regarding checking strollers, car seats, mobility devices and sports equipment.
US Airways policies regarding checking strollers, car seats, mobility devices and sports equipment.
Continental's policies regarding checking strollers, car seats, mobility devices and sports equipment.
American Airlines policies regarding checking strollers, car seats, and sports equipment.
Luggage Limits provides the cost of transporting luggage for over a dozen US Airlines for over 3000 airport locations.
Like many things in the air travel industry, these regulations are changing again and there is INCREASED flexibility in items that may be toted in your carry-ons.
With most airlines, infants who travel and don't occupy a seat are still given a luggage allotment. Some of the possible items that may be allowed are covered.
Security measures at airports have been revised again. To quell the confusion, I've compiled a list of items now permitted on board flights departing from the United States and Canada.