Originally Posted by
rickair7777
My guess would be fireworks.
No way it was a manpad. If someone went to the trouble to acquire one they would presumably learn a little bit about it's capabilities...they would not waste it on an RJ in the mid-teens, at the extreme upper limit of manpad capability with very-low to zero chance of a hit.
Fireworks are at 1000 feet. Either this pilot has a severe depth percetion problem or it wasn't firworks near his altitude. Even if his judgement was off and it was several thousand feet below his aircraft as opposed to 150 feet, whatever went up there wasn't an Estes (hobby) rocket either.
We'd still be talking a mile and a half to two miles vertically.