If you are referring to a car seat bag, yes, you can check one booster or car seat per child traveling so you can put both in a bag. That bag does not count against your checked baggage allowance.
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Customers with children are allowed to check one stroller and one car seat without charge. This allowance applies to any type of stroller and/or car seat and is in addition to the regular baggage allowance. Customers may check the stroller and car seat at the curb, ticket counter, or gate.
Customers traveling with children will be allowed to check one stroller and one Child Restraint System (CRS) or car seat per child without charge. This is in addition to the regular free baggage allowance.
One child over 14 days old and under two (2) years of age not occupying a seat may be carried free of charge when traveling with someone 12 years of age or older. If you plan to travel with an infant as a Lap Child, you must pay the taxes and fees that apply to the international portion of the infant's itinerary.
Lap child policy. Who qualifies as a Lap Child? One child over 14 days and under two (2) years of age, not occupying a seat, may be carried as a Lap Child when traveling with an adult (12 years of age or older). Each adult may travel with one Lap Child.
If your seat has been approved for aircraft use, there will be a sticker (either on the back, bottom or side of the seat, depending on the size of the label) that says This restraint has been certified for use in motor vehicles and aircraft in red lettering.
Most U.S. airlines will permit children who have reached their fifth birthday to travel unaccompanied. Kids ages 5 through 11 who are flying alone must usually travel pursuant to special “unaccompanied minor” procedures. On some airlines, these procedures are required for unaccompanied children as old as 14.
Up to two adults traveling with a child six years old or younger may board during Family Boarding, which occurs after the “A” group has boarded and before the “B” group begins boarding. There should be enough open seats to enable the child to sit next to at least one accompanying adult.