Unifor filed an unfair labour practice complaint with the Newfoundland and Labrador Labour Relations Board against U.S.-based D-J Composites.

The company locked out its Gander aerospace employees on Dec. 19, 2016.

"The proposals tabled by the company on March 7 included a blatant attack on seniority protections for workers — a clear sign that D-J Composites seeks to bust the union in this workplace," said Lana Payne, Unifor Atlantic regional director.