We used to take a BAC1-11 in there in the early/mid seventies for GF, arrive late at night having just done half of what was known as the "Gulf Air Easy Six",
(BAH-DOH-AUH-SHJ and return), day off in Dubai then early start back to Bahrain next morning. Shared the tarmac with an Air Ceylon Trident!
Most of the original airport has been built on now. If you can find a copy of "Beyond The Blue Horizon" by Alexander Frater I think you will find some pictures in there, including the fort.