Related Clues:

• Popular low-fares flier: abbr.
• No-frills carrier: abbr.
• Namibia until 1990, briefly
• UAL competitor
• United competitor: Abbr.
• Namibia, formerly (initials)
• Tex.-based carrier
• Dallas-based carrier: Abbr
• Giant among low-cost carriers: Abbr
• Budget carrier HQ'd in Dallas