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Your success may vary, depending on the airport and the carrier (or if you get a picky flight attendant).
The closest we’ve come to having any trouble was when a security person (neither an airline employee nor TSA – just someone who makes sure you have a boarding pass before getting in the security line) challenged the size of the bikes at SFO. We called over a Delta gate agent and told him that we take the bikes on all the time, and he ushered us through. Confidence helps a lot here.
The Brompton and T-Bag both went right onto the conveyor belt and the x-ray image of the bike looked very cool. A TSA supervisor came by and asked about the Brompton (presumably they don’t see a lot of bikes on the x-rays). When Dmitry told the supervisor that it was a bike, the supervisor asked if this had been cleared with the airline. Dmitry bluffed and said that he did this all the time – which seemed to be good enough for the TSA.
Security attendants/custom officials aside, most airport employees are plucky jobsworths...smiling and being a pleasant individual does fuck all.
A few tricks, it seems, will do the job:
from here: http://www.ourlifeunfolded.com/how-to-take-a-brompton-on-a-plane-as-carry-on-luggage/
Removing the seat should help a lot indeed.