Today, most airlines charge baggage fees though the rules vary widely. On many airlines, the first bag under 50 pounds is free with a charge for each additional bag. Some airlines charge for all checked bags, and some airlines even have new "low fares" that charge for carry on bags. While OnVoya often attempts to provide helpful baggage information when you’re booking a flight, the best, most current information always comes directly from the airline. You can either call the airline or use your reservation number at the airline’s website.