Originally Posted by YYCOllie
I've only seen it (ie been on a plane) on MD-80s at DFW and DC9s at MSP/DTW
Yep, recent experiences:
DFW - AAMD80 (not very often)
MEM - NWDC9 (more often than not)
MSP - NWDC9 (sometimes)
DTW - NWDC9 (sometimes)
Read somewere ( I think on airliners.net ) what determines the need for this as opposed to a tug