What Terminal is Sun Country at Orlando? Sun Country Airlines serves passengers flying into and out of Orlando International Airport (MCO). The airport's main terminal structure contains airline check-in, baggage services, security access, and departure facilities. MCO provides a range of dining, retail, transit, and passenger services to make your journey more convenient. Travellers should double-check their flight details before arriving, since terminal or gate information can change. Arriving early is also encouraged to allow for check-in, baggage drop, and security screening.