FedEx Express pilot leaders called for a Strike Authorization Vote of its pilots April 14. If approved, FedEx Express pilots will be allowed to withdraw their services when permitted by the National Mediation Board (NMB), and if deemed necessary by pilot leaders.

The FedEx Master Executive Council said a strike would only take place if negotiations break down between the two parties and if the federal government authorizes a walkout. If that happens, the NMB will have to release the two sides from mediation. Then, after a 30-day waiting period, both groups could exercise self-help in the form of a strike by the union or a lockout by the company.

“FedEx has failed to acknowledge pilot contributions and FedEx pilots are prepared to take this fight to the Company. This announcement should also alert FedEx customers that should FedEx pilots be unable to successfully conclude negotiations, they should be planning alternative means in the event pilots must strike,” reads a statement from the FedEx Master Executive Council. “Now is the time for FedEx to deliver a new pilot contract.”

The Strike Authorization ballot officially opens April 18. The voting period ends May 17.