Planemaker is right. Most parts for commercial aircraft of any type are manufactured around the globe, so the only thing that really ties them to a specific nation is the "top" manufacturer, the one who markets the plane - Boeing, Airbus, Bombardier and the like. As planes become increasingly sophisticated, construction of complex individual parts is best left to the professionals in that field - and those do not necessarily have to be from the same country. The ones offering best performance for the lowest price are awarded the contract - for money does not know borders, or colors, or nationalities.
Imagine just what would happen if say Boeing or Airbus started making their own engines instead of buying them from GE
, CFM, P&W or RR
. It would be doubtful if their airliners would even be able to get off the ground.
No plane, no gain.