I need to know about the IATA code of IAD airport.
This code is for the Dulles International Airport.
Anyone can help, please?
The IATA code of Dulles International Airport is IAD, not 00A.
00A is a small field in Bensalem, PA named Total Rf.
Its not clear what you are asking for.
There is documentation for the Airport queries on at the following page. AeroAPI Developer Portal - FlightAware
The function you used just returns a list of airports.
Are you looking for traffic at IAD or just the airport info?