Aircraft manufacturer Bombardier has won its case against United States proposals to impose tariffs of 292% on its imports to America in a move which should safeguard thousands of jobs in Belfast.
The US International Trade Commission (ITC) said rival manufacturer Boeing did not suffer injury from Atlanta-based Delta Airlines' order of Bombardier's C Series passenger jets.
The C Series wings are produced in the Northern Irish capital and workers reacted with jubilation to the news.
Bombardier said in a statement: "Today's decision is a victory for innovation, competition, and the rule of law.
"It is also a victory for US airlines and the US travelling public.
"The C Series is the most innovative and efficient new aircraft in a generation.
"Its development and production represent thousands of jobs in the United States, Canada, and the United Kingdom."