What could this object in the sky have been?

My boyfriend and I were on the highway (heading south on the 405 between LAX and Long Beach) and we both saw a blue light appear in the sky very briefly. It appeared to be moving rapidly, and while we had a clear line of sight, it disappeared after only a second or so.

We concluded it was most likely a shooting star, but I am wondering if there are any other possible explanations. That stretch of highway is near a lot of airports with heavy air traffic, so it seems reasonable that this light could have been some kind of plane, except it moved too quickly and appeared to briefly to be a normal, commercial plane.

Can any aviation enthusiasts or astronomers solve this mystery?