1.  But a United deal had numerous stumbling blocks.

2.  Few carriers appear to be interested in making such a large acquisition now that the United deal has fallen apart.

3.  Nevertheless, there are those who believe that a United deal is not so far-fetched.

4.  The Delta pilot union contends a board seat would protect pilot interests in the United deal and any other moves that could affect growth and career paths.

5.  Last month, pilots at American Airlines rejected a one-year extension of their contract, based partly on the generosity of the United deal.