It is feasible? Air travel within Europe with one checked volume only : r/Brompton
B&W Foldon Flight Case | Brompton Bags
FOLDON.BAG PACK | bike bag | B&W International
Lesson learned: JetBlue is not bike friendly. $100 bike fee each way and they managed to break the zip on my Brompton luggage bag too. I recommend Delta, United, Alaska or Southwest