Looking for a definitive answer on which side of row 1 has a bassinet on 767-400, please. United's website says row 1 without distinguishing. I called reservations, and they said AB side only, without confidence, and without explanation of how that's supposed to work given that 1B is blocked for airport assignment. Seatguru has boilerplate language that relates to non-flat bed cabin configurations, so not helpful. UA website says PMCO 777 has bassinet in flat-bed 8AB only, but somehow my son traveled (too briefly) in the bassinet at 8KL last year, so even specific information from the website is suspect.