stratofortress

I like to keep a log of the planes I've flown, so I try to get the tail #s.

I've asked the flight attendants, and none seem to know what the tail # of the aircraft we're flying is.

Normally I just look at the tail through the window before boarding, but sometimes I'm coming in on a quick connection and leaving on one and don't have time/forget.

Once, I asked a gate agent who replied to me with some hostility: "we can't give that information out for security reasons."

Not sure, but is there any way to find this information out online or somewhere else?