I was driving into the rideshare parking lot at Dulles airport on a slow cruise to make a u-turn As I was looking off into the distance and up I noticed very closely behind this building hanger was this huge tin colored almost like a giant blimp that was hovering as if it was Being floating as in a parade it was very low but giant sized ..I new job a comedic sense I was seeing something that is not normal ..

I’d say the size of a blimp and looked like A blimp but it was a dull tin color with nothing written on it .
I was going to reach for my phone when I did t want to miss what I was looking at .. as I made the U-turn it was gone ..
 I pulled maybe 75 feet into the parking lot from where I saw it and there was nothing there anymore ...
Military experiment ??That part of the airport there isn’t really anything there going on ...
 Definitely was gone as if nothing ever happened within seconds