Southwest Airlines founder Herb Kelleher has died, airline said

(Southwest Airlines)

DALLAS – Southwest Airlines founder Herb Kelleher has died, according to the airline.

Southwest Airlines tweeted news about Kelleher's death.

Jon Ostrower, editor-in-chief of The Air Current, tweeted the announcement was first released in an internal message.

Aviation leaders have been reacting to the news of Kelleher's death

Kelleher is seen here posing with Willie Nelson.