SINGAPORE – Airbus is negotiating a preliminary order for up to 100 A220 jets as it prepares to buy out Bombardier’s minority stake in the Canadian-designed jet, industry sources said.

The marketing effort lifted a subdued Singapore Airshow as industry sources said Canada’s Bombardier was ready to announce that it would cede its stake in the A220 program to majority owner Airbus and complete its exit from commercial aviation.

Airbus declined to comment. The Wall Street Journal identified the potential buyer as Nigeria’s Green Africa, which in late 2018 struck