Speed, Safety and Comfort (1929)
Speed, Comfort and Convenience (1935)
Delta Air Lines—The Trans-Southern Route (1935)
The Airline of the South (1944)
None Faster—None Finer—To and Through the South (1948)
Nothing Faster, Nothing Finer—To and Through the South (1950)
Serving the South and the Nation (1951)
Serving __ states and __countries / Serving __ cities and __ countries (1953)
None Faster, None Finer (1955)
Delta—One of America's Pioneer Scheduled Airlines (1956)
Hospitality and Service from the Heart (late 1950s)
DELTA the airline with the BIG JETS (1959)
DELTA Best Thing That Ever Happened to Air Travel (ca. 1966-1968)
Delta Is Ready When You Are (1968-December 1984)
That's the Delta Spirit
DELTA. The Airline Run by Professionals. (1970)
Delta Is My Airline (1974)
Airlines Are the Same; Only People Make the Difference (1980)
Delta Gets You There (1984-1987); several variations: Delta Will Get You There, Delta Gets You There with Care
We Love to Fly and It Shows (September 1987).
Ready When You Are (ca. 1992)
You'll Love the Way We Fly (1994)
On Top of the World (1997)
Fly _____ (2000)
good goes around (January 2005-April 30, 2007)
Change is: (May 2007)
One Great Airline (2008 Northwest Airlines merges with Delta)
Keep Climbing (September 2010)