Instructions
Decide what type of airport terminal --- passenger or cargo --- you are going to operate at your airport.
Build all buildings necessary in order to open your airport. Create at least one runway, several taxiways, several plane stands, an apron (the road used by airport-support staff), a turnaround area (which handles cleaning, catering and baggage handling), an airport maintenance building and either a cargo or passenger terminal.
Open your airport and begin acquiring contracts. Search your messages for new contracts as they become available to you. Double-click on the "Contract Offer" message in the "Message Panel." Decide whether to "Accept," "Decline" or "Renegotiate" all contract offers.
Choose between "Airline Contracts," "Outside Contracts," "Inside Contracts" or "Airline Service Contracts."
Agree to the contracts to begin acquiring planes from the airlines.