airtrain (**Noun**: Refers to a type of transportation system, typically an elevated train that connects airports with city centers or other locations.)
1
Elevated train connecting airports to cities.
2
Automated people mover at airport terminals.
3
Light rail system serving air travel hubs.
4
Shuttle service for passengers between terminals and stations.
airtrain (**Verb**: Although less common, it can be used informally in some contexts to mean training someone for air travel-related tasks.)