Enhanced frame at 300% shows a cigar or disc shaped metallic object crossing the flight path of his plane:
https://www.youtube.com/watch?v=I0Hr5ZPwBx8
In this segment, we cover News Footage from Fox 10 News in Phoenix that potentially shows an Unidentified Flying Object passing below the flight path of newly elected President Trump's plan.
Link to actual Fox 10 footage here (while it lasts!):
That definitely looks like a gull to me. :^)
LOL. could have been, although it tends to look like it's flying behind the flight path of the plane, meaning that it would have to be about 15 feet wide to appear that size in relation to the size of the plane. =P