Martian craft, maybe

• Vehicles in some close encounters, for short
• Abductees' destinations, in some hard-to-believe stories
• Sky saucers
• Hover crafts?
• Subject of some faked photos
• Sci-fi saucers, for short
• Aliens' craft, for short
• "Independence Day" fleet
• Some people believe swamp gas causes them, for short

Wiktionary Word definitions in Wiktionary
n. (plural of ufo English)