Regarding ATC ground communications, what/who are the following callees? Are these aircraft, or vehicles, or people?
- [Airline name] maintenance
- [Airline name] tug
- [Airline name] mechanic
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If you are driving a vehicle anywhere within the movement controlled area of an airport you need to be in contact with the ground controller.
1 & 3 are virtually synonymous, it is a person, a mechanic, working for the named airline's maintenance department, driving a vehicle.
2 is a person driving a aircraft tug vehicle.
This is the closest I've got as for an answer. This information was gathered from a comment came in for an answer which is now deleted together with the answer itself.
This answer needs improvements and confirmation from someone who is more knowledgeable.
1. [Airline name] maintenance
An aircraft manned by a mechanic on the ground. Usually calls for repositioning.
2. [Airline name] tug
A tug works for or operated by the named airline.
3. [Airline name] mechanic
A possible synonym for [Airline name] maintenance