I drive to work just south of BWI/Marshall airport every morning.
I looked up and literally thought there was going to be a mid-air
collision!
Then, I thought - "Oh crap! There's a plane with gear problem!"

What I saw was a plane that was along the lines of an MD-80,
and off the right wing was a corporate jet - something around an
8 or 10 seat - corporate jet. It was about in the range of 30 to 50 feet
off the wing.

I couldn't get my camera phone there in time for a close-up!
For about 5 to 10 seconds, I was really worried.

Well, they were making a departing, tight (impressive) left turn from the
southwest to fly east. It was actually a very nice formation flight.

But what the heck? It must have been someone important!
I doubt they took off with each other. I caught them in my eye when they
were probably about 1000 ft agl.

What the heck?

White, couldn't tell markings.

I had to apologize to the driver behind me for slowing down to watch that!