The following exert is an eye witness statement. Please read into it what you will. This has been reported to mufon who I am sure are investigating:
I was on my flight back home from tucson, az to denver, co when i saw out of the window of the plane an orb like object hovering beside the the wing of the plane. i first thought it was something on the window but the ufo moved up and down in the same position. this made me curious about what this object really is. the object flew past the wing and i never saw it again.