Strewth. Crikey. Bloody hell. An Australian woman has reportedly sparked a security scare aboard a US flight after her use of a common Australian phrase was apparently misinterpreted as an act of aggression.

Sophie Reynolds, 41, from Queanbeyan, was flying aboard SkyWest Airlines from Atlanta to Pittsburgh this week when she asked a flight attendant if she could have a pack of pretzels instead of crackers.

"[The flight attendant] said they didn't have any [pretzels], and I said, 'Fair dinkum,' out of frustration," Reynolds was quoted as saying in the The Atlanta Journal-Constitution.