Merhaba,

My name is Yvette, and I need to schedule a flight from Istanbul, to Texas for my husband... but I don't know which service to use that is economic. Any suggestions?

turkish airlines are better and cheaper, put maybe need iberia

Hi Yvette,
The cheapest airlines are Lufthansa and Delta Airlines. Lufthansa connects over Germany. Delta Airlines may connect over Paris or Milano.
Best service is given by Turkish Airlines but it will be the most expensive.
You can try orbitz.com for cheap flights.