Delta Airlines' fleet is getting older, not younger, according to a new report.

The Wall Street Journal reported on Friday that Delta is gobbling up as many older MD-90s as it can. The airline believes it can get those planes on the cheap, rehab them and keep them in the air.

Analysts say there is no safety risk associated with older airplanes.

American Airlines, which is one of the biggest private employers in South Florida, is going the opposite route.

American just spent $40 billion on 460 brand new, more fuel efficient airplanes. Those airplanes will be delivered over the next several years.

The Journal also reported that Delta also bought a oil refinery to help reduce fuel costs.