I booked 2 BA First tickets using the companion pass from JFK to LHR for travel on mid july. I want to push back our return flight by 1 day, been checking on and off for about a week for the day and time (evening flight) I would like to travel, but without any luck. I'm also checking revenue tickets on their website and I see the flight I want available for purchase. Here are my questions? If I see the flight I want for purchase, does that mean there are seats available on that flight? Or are they aiming to oversold the flight? If there are seats available, what are my chances of getting on the flight I want if I wait it out? I don't want to wait too long because I don't want to risk not being able get onto a earlier flight (2:40PM) on the same day. Any help and advice is much appreciated!