Air commodore is never shortened to Commodore, which is a rank in various naval forces. Air commodore is a one-star rank and the most junior air officer rank, being immediately senior to group captain and immediately subordinate to air vice-marshal. It has a NATO ranking code of OF-6 and is equivalent to a commodore in the Royal Navy or a brigadier in the British Army or the Royal Marines. Unlike these two ranks, however, it has always been a substantive rank. Additionally, air commodores have always been considered to be air officers whilst Royal Navy commodores have not since the Napoleonic Wars
Royal Scots Navy that of England. The office of Lord High Admiral was subsumed within the office of the Admiral of Great Britain. The three vessels of the small Royal Scottish Navy were transferred to the Royal Navy. A number of Scottish officers eventually left the Royal Navy for service in the fledgling Russian navy of Peter the Great. These included the captain of the "Royal Mary" Thomas Gordon, who became a commodore in 1717 took service and rose to be Admiral and commander-in-chief of the Baltic Fleet. The most accessible work on the Old Scots Navy and Scots naval matters, prior to