They don't have a right to force a vote for "any reason".
However, ... When unions petition the NMB as the IAM and TWU did to apply for representation rights as " The Association", at that time, the company absolutely has the right, and is asked by the NMB, if they dispute the application.
If a company does dispute, and there is satisfactory showing of interest, there is an election.
If the company does not dispute the application and there is satisfactory showing of interest, there is a certification, without a vote.
I'm on record, many times, that the way the IAM and TWU did this was dirty, but the NMB, and the company played along, and now we are blessed with the Ass. Yay