Why it's the Aerospace manufacturing in Mexico more profitable?

First of all because Mexico has competitive labor costs and this industry in Mexico holds more than 300 aerospace companies with key OEMs like Honeywell, Cessna, Beechcraft, Textron International, Bombardier and Eurocopter.

This growth has led to the integration of aerospace clusters, where the industry, government and academia are working together to facilitate growth and transformation into regions with Maintenance, Repair and Overhaul (MRO) projects and eventually to make an final assembly line and take off of an aircraft fully made in Mexico.

Source: American Industries Group

Cause trump uses old parts from Taiwan for his military

Because they can pay slave wages. Is that what you're hoping for for us?

Obviously u don't have a clue about Reality of labor costs.