(up) in the air vs incomplete

(up) in the air

incomplete

adj
  • Not complete; not finished 

  • Of a flower, wanting any of the usual floral organs. 

noun
  • A designation of being incomplete. 

  • A multipart file posted to Usenet that is incomplete and thus unusable. 

  • A multiplayer game that is abandoned because one player disconnects. 

How often have the words (up) in the air and incomplete occurred in a corpus of books? (source: Google Ngram Viewer )