Question: What city is Martinair based out of?

Context paragraphs:
Martinair: Martinair, legally "Martinair Holland N.V.", is a Dutch cargo airline headquartered and based at Amsterdam Airport Schiphol and a subsidiary of Air France-KLM.  The airline was founded in 1958 by Martin Schröder.  Since 2011, Martinair has operated entirely as a cargo airline with scheduled services to 20 destinations worldwide and additional charter flights.  Prior to that date, passenger flights were also operated.

Martin Schröder (aviator): Johan Martin Schröder (born 13 May 1931 in Amsterdam) is a Dutch pilot and founder of Martinair, the second Dutch airline (after KLM) and the first Dutch air charter company.  At the founding in 1958 the company was known as Martin's Air Charter (MAC).

Supporting paragraphs: Martin Schröder (aviator) Martinair
Answer: Amsterdam