When we were at the legendary Delta DO in 2010, I overheard a conversation one of our group was having with a Delta tech ops employee, and they were talking about tow bars, and if you didn't use the right tow bar with a specific model of airplane, the tow bar could break, or, in the alternative the landing gear on the plane could be damaged. Something I had always taken for granted and never thought about.

So, as strange as it may seem, this is one of the many issues that the rampers and supervisors have to deal with in preparing a flight to leave.