[2] Established in 1997, Key Lime Air operates scheduled air service, various types of public and private charter (under its Denver Air Connection brand), and United Parcel Service cargo feeder operations.

[3] Key Lime Air operates FAR Part 121 scheduled regional flights through its Denver Air Connection brand from Denver International Airport.

Additionally, Key Lime operates public air charter services under FAR Part 135 from Denver's Centennial Airport.

Key Lime Air operates on-demand cargo flights using Fairchild Swearingen Metroliner aircraft.

Cargo operations carry UPS overnight and express delivery packages throughout Colorado, Wyoming, Nebraska, and Kansas.