When you arrive at the MSP ticket counter and they see you in line (while helping someone else) and wave to you...and when you get to the counter they ask where you have been for 5 weeks (and MSP isnt your home city!!!!).
The DL ground staff at your home airport waves to you when they see you in the window as they are driving the jet bridge in to the plane! Or when they stop in the gate area to hang out and chat with you prior to your flight!