I was on a united airlines flight ua179 just after backing out of gate c123 at newark airport terminal c. the plane was taxiing for take off but stationary for a while. we were leaving on time and it would have been around 3.10pm on sunday 14th july 2019. a few mins earlier i'd noticed a non military helicopter from my window seat which i though was strange as i live in view of hong kong airport and do not see helicopters at the airport, and it was at a height that would interrupt aeroplanes. then i noticed a stationary hovering object which i thought nothing about as i'm used to seeing planes slowly circling, landing, taking off from my nearby airport, and fuselage glare so it seemed normal but after not moving at all for 3 minutes it seemed unusual so i recorded 1.09 minutes of footage. i also managed to catch footage of a plane approaching from a similar angle by chance to show the contrast in visuals and speed. there were heatwaves which makes the object look shake, and the 2 pane aeroplane window made it difficult for my huawei camera to focus at times as a caveat to mention. unfortunately my plane started moving and i lost sight of it and didn't see it again but it would be interesting to see if this can be debunked or collaborated somehow.