by july 2016, bombardier aerospace set up the c series aircraft limited partnership (csalp) with investissement québec. on 16 october 2017, airbus and bombardier announced that airbus would acquire a 50.01% majority stake in this partnership, with bombardier keeping 31% and investissement québec 19%, to expand in an estimated market of more than 6,000 new 100-150 seat aircraft over 20 years. airbus's supply chain expertise should save production costs but headquarters and assembly remain in québec while u.s. customers would benefit from a second assembly line in mobile, alabama. this transaction was subject to regulatory approvals then expected to be completed in 2018. airbus did not pay for its share in the program, nor did it assume any debt.