user: Question: Which ICAO has a Fleet size of 2?
Columns: ['Airline', 'ICAO', 'IATA', 'Callsign', 'Commenced operations', 'Fleet size', 'Headquarters']
Types: ['text', 'text', 'text', 'text', 'real', 'real', 'text']
Sample row: ['AirAsia Zest', 'EZD', 'Z2', 'ZEST', 1995.0, 11.0, 'Pasay City']
SQL:

assistant: SELECT "ICAO" FROM "Table" WHERE "Fleet size" = 2.0;