I'll be traveling with my family in March on Frontier (with Summit status), and have tickets booked, and my mother-in-law decided she would like to join us, and booked the same ticket separately. She is now asking about sitting with us - is it possible to combine her pnr onto our existing pnr so that she can enjoy the benefits and sit with us, or will she be stuck in the back of the plane? I called a telephone agent, and she said all she could do was note in her PNR that she was traveling with a Summit member, and they would try and accommodate at the airport - sounds like SOL to me...