I cannot understand how any FAA-approved seat, no matter make or model, could not be installed in an F seat. There are certain equipment types that make for a tight fit in coach due to their narrow seats (i.e., 17"), but any DL mainline F seat should be plenty wide for even the largest of seats (like our Britax Marathon). Sounds to me like something odd transpired here. Were they, perchance, on a 747/777/767/757 with air-bag-equipped (i.e., international business class) seats up front? In that case they are not allowed.
Answering your question directly, though, we swear by the Cosco Scenera for plane travel. Exceptionally light and fits in every plane we've ever been in (and it's flown 'round the world many times on dozens of airlines).
Last edited by Erasmus; Jul 23, 2014 at 10:34 pm