NTSB investigating Southwest Airline plane damage

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Officials from the National Transportation Safety Board spoke at at a press conference Sunday regarding the large hole that ripped through a Southwest Airline airplane on Friday.

The plane made an emergency landing in Yuma after taking off from Phoenix.

The foot-long tear was at the joint where the plane's skin is riveted together.

NTSB officials say the rip was due to regular wear and tear.

Southwest Airlines canceled 300 more flights Sunday.