Question: What is the location identifier of the Geneva Airport railway station?
Sentence (from "Geneva Airport railway station"): The Geneva Airport railway station (French: "Gare de Genève-Aéroport" ) is a train station located underground next to the terminal building of Geneva International Airport (French: "Aéroport international de Genève" ) (IATA code: GVA), in Grand-Saconnex, Geneva, Switzerland.
Relevant evidence: Yes