The correct spelling of the phrase "wast in the air" is actually "wasn't in the air." The sound /w/ is followed by the schwa sound /ə/, which gives the impression of a voiced /z/ sound but is actually silent in this case. Therefore, the correct pronunciation is [wʌznt] and the spelling should reflect this. Accurate spelling is important in communication, especially in written communication where there is no opportunity to clarify misunderstandings that may arise due to misspellings.