ADD, ADHD: Britax

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Air Travel with Britax Marathon

I have a 2 year old and planning on going on a 6 hour plane trip. We purchased a seat for out toddler and prefer to use a carseat since otherwise she won't sit still. We have a britax marathon. Is it too big and bulky for plane seats? Should we purchase a cosco Senera for the trip? Also we don't mind lugging the marathon through the airport, just want to make sure it fits on the plane. And we don't want to use a cares harness. Any suggestions are greatly appreciated! Thanks.