Join Date: Jan 2005
Location: New York, NY
Programs: UA, AA, DL, Hertz, Avis, National, Hyatt, Hilton, SPG, Marriott
Posts: 10,118
Post-deregulation CO had three classes of service on international flights from about 1985 (roughly when the business class 'revolution' began in earnest, along with CO service to LGW) through 1992, when BusinessFirst was born.
DL's BusinessElite debuted in 1998, I believe.