If you were flying N251AT on Thursday night, around Long Beach and a United Airlines flight was talking to you, that was me 
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Took a checkride in that plane…but that was last Oct
I am pretty sure that I have flown it as well, but it sure would have been a long time ago.
Chris
Chris,
I meant to ask but forgot a few days ago. How did you know it was an ATP aircraft since ATP uses tail numbers? Do all the tails end in AT?
Tom,
Not all of ATP’s airplanes use tail numbers that end with “AT”, but many of them do. I head a Seminole with a tail number ending in AT on the radio and asked the guys flying it if it was an ATP airplane, they said that it was.
Chris
That was one of my instructors and his student heading up to SBP and back to LGB to meet Commercial multi engine requirements.
Ezekiel,
Small world out there 
Chris
Up* There!
-Erik