Final answer:
The marketing strategy described is a concentrated marketing strategy, where the company focuses on serving a specific target market segment.
Step-by-step explanation:
The marketing strategy described in the question is an example of a concentrated marketing strategy. The company, Premium Airlines, focuses all its service efforts on customers who prefer to travel in style and comfort, and therefore only offers executive seats on its airplanes. This approach allows the company to specialize in serving a specific target market segment rather than trying to cater to multiple customer segments.