what is delta
Delta commonly refers to: Delta (letter) (Î´ or Î´), a letter of the Greek alphabet. D (letter), called Delta in the NATO phonetic alphabet. Delta Air Lines, a American airline Delta Connection, a regional airline brand name for Delta Air Lines. Delta Express, a former no-frills brand owned and operated by Delta Air Lines from 1996 to 2003. Delta Shuttle, the brand name for Delta Air Lines' hourly air shuttle services.