Question: The airport that serves as the home base for the largest airline of Belgium is home to approximately how many companies?
Sentence (from "Tallinn Airport"): Tallinn Airport (Estonian: Tallinna lennujaam , IATA: TLL, ICAO: EETN ) or Lennart Meri Tallinn Airport (Estonian: Lennart Meri Tallinna lennujaam ) is the largest airport in Estonia and serves as a hub for the national airline Nordica, as well as the secondary hub for AirBaltic and LOT Polish Airlines.
Relevant evidence: No