Seat kickers are America’s most infuriating co-passengers for a second year in a row. (iStock/iStock)

Everyone has their in-flight pet peeve — the nonstop chatter, armrest hog or shrieking child. But seat-kickers are the worst, according to Expedia’s third annual Airplane Etiquette study.

Seat-kickers are America’s most infuriating co-passengers for a second year, with 61 percent of U.S. respondents citing the behavior as their No. 1 annoyance. Inattentive parents were not far behind with 59 percent, followed by the aromatic passenger, with 50 percent.

The travel site teamed up with research company Gfk to rank the most frustrating passenger conduct by interviewing 1,019 randomly selected adults.

Overall, respondents prefer to keep to themselves during flights. Only 16 percent said they used air travel to meet and talk to new people. (Sixty-six percent “dread” sitting next to these social individuals.)

This might be why the louder passengers, dubbed the audio insensitive by Expedia (50 percent) and chatty Cathy (43 percent), earned top spots on the list.

“Inside a packed plane at 30,000 feet, both good behavior and bad behavior are amplified,” Expedia.com’s vice president and general manager, John Morrey, said in the release.

Yet many choose to avoid confronting etiquette violators, with 49 percent of respondents saying they just tried to ignore them.

Despite the bad rep seat-kickers and their fellow aggravating co-passengers have, three quarters of Americans feel “for the most part, fellow passengers are considerate.” With luck, these positive attitudes will persist through the impending holiday travel season.

The top ten etiquette violators from Expedia:

1. Rear Seat Kicker (61%)

2. Inattentive Parents (59%)

3. The Aromatic Passenger (50%)

4. The Audio Insensitive (talking or music - 50%)

5. The Boozer (45%)

6. Chatty Cathy (43%)

7. Carry-On Baggage Offenders (38%)

8. The Queue Jumper (rushes to deplane)(35%)

9. Seat-Back Guy (the seat recliner - 32%)

10. Overhead Bin Inconsiderate (stows bag in first available spot, rather than nearest to his/her seat - 32%)

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