Carrying your own travel car seat along with you is also a good idea. However, you should check with your airline by which you plan to travel to see if they consider car seats and strollers as part of the baggage allowance. Domestic and international flights also have different baggage allowances, so confirming with the airline before hand is always a better idea.
Booster seats come with a back or backless. Smaller children will find the model with a back a better fit. The whole idea here is to elevate or boost the child so that they can safely use the seat belts that are installed in the car. Boosters do not have their own harnesses.
Although a baby which weighs less than 40 pounds can share an adult seat, you may find it more convenient flying with a car seat. Most airlines recommend this, particularly on a long haul flight, for the comfort and safety of both you and your baby. In the United States most car seats will have FAA approval so there certainly should not be a problem with domestic flights. To make sure you are not asked to check your child seat in as baggage you must make sure your CRS is approved and has "This restraint is certified for use in motor vehicles and aircraft" printed on it.
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