In most other English-speaking countries, air-forces have their own ranking structure with titles like "Flight Lieutenant", "Squadron Leader", "Wing Commander", "Group Captain" etc. The exception is the United States Air Force which ranks its officers with equivalent Army titles such as "Major"(Squadron Leader), "Lieutenant Colonel"(Wing Commander), "Brigadier" (Air Commodore) etc.
In all other respects the ranking systems of the US military follows an internationally recognised pattern. (which I believe is codified within e.g. NATO)
Is this because the USAF, for a long time, was not a separate service but part of the Army? I believe it was well after WW2 that it was given a separate status. It seems surprising that inter-service rivalry has not demanded separate treatment, such as is maintained by the US Navy.
Has there ever been any movement to change this?