Question: Hi Fly Malta is a subsidiary of a charter airline located in what city?
Related documents: [0]  [DOC] Hi Fly Malta is a Maltese charter airline based at Malta International Airport and a subsidiary of the Portuguese Hi Fly. [END] 
[1]  [DOC] Hi Fly is a Portuguese charter airline headquartered in Lisbon. [END] 
Answer: 
Lisbon
Lisbon