ATM phase used in ConOps scenario, prior to pushback or taxi at the gate, ramp, or parking area, while the aircraft is stationary.
SESAR Concept of Operations Step 2 Edition 2014 (Ed. 01.01.00)
This phase also include pushback when the aircraft is moving in the gate, ramp, or parking area, assisted by a tow vehicle (tug).
Lexicon Release 2015.1