Clue: Former fast-flying planes: Abbr.

Answer: SSTS

Length: 4

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Similar Clues:

• Retired fast planes: Abbr. (SSTS with 4 letters)
• Former fast planes: Abbr. (SSTS with 4 letters)
• Fast planes: Abbr. (SSTS with 4 letters)
• Grounded fast planes: Abbr. (SSTS with 4 letters)
• Fast and furious, e.g.: Abbr. (ADJS with 4 letters)
• Of planes and flying (AERO with 4 letters)
• Flying level: Abbr. (ALT with 3 letters)
• Fast, to slow: Abbr. (ANT with 3 letters)
• Flying group: Abbr. (e.g. ATC with 3 letters)
• "Fast cash" sources: Abbr. (ATMS with 4 letters)