The study, conducted by global research firm GfK, asked 1,000 Americans to rank the most annoying on-board behaviors of fellow passengers. Rear seat-kickers pushed last years top offenders, the inattentive parents, into second place, followed by the aromatic passenger, the audio-insensitive passenger, the boozer and the chatty Cathy. Expedias Airplane Etiquette Study is a lighthearted reminder that few places require more attention to etiquette than the inside of an airplane, said John Morrey, Expedias vice president and general manager, in a statement. Youre in a tight space at 30,000 feet with hundreds of fellow travelers, so even the small things helping your neighbor stow a bag or switching seats to put a mom next to her child can make a huge difference. And someone might post pictures or video of your offending behavior online. RELATED: 18 most annoying things people do in airports About 12% of those surveyed say they would record an incident, and 6% say they would use Twitter and other social media to shame passengers. Only 22% would be brave enough or foolish enough?