How to Select Pushback Equipment

[adpeguero@gmail.com]

How does one default ground equipment in airports?  What I'd like to do is to select Delta Airlines equipment.  I would think this would be an option in an airport like KATL which is Delta's main hub.  I sometimes see it popup in a menu asking me to select the ground equipment but that menu pops up for like 2 seconds and then disappears and loads something else like AA or Southwest on its own.  Major immersion killer.

[virtuali]

I strongly suggest reading the manual, because this is really a basic usage question that is surely answered there, in the airport customization chapter.