The map on the top, dated 1934, was titled Landfill Plan for the New Airdrome. (I colored three areas and added some text to make it easier to read. You can click on it to enlarge.) The three airdromes on the map (current, substitute, and new) were referred to in the accompanying document Summary on the Landfill Project for the New Airdrome, which is shown below. The project called for a new airdrome that was to be at least five times larger than the current Reigaryo Airdrome that had been completed in 1933. Before the new airdrome was finished, an interim substitute airdrome would be built to the south of the current one.
The next image is obtained by overlaying the first map on an aerial reconnaissance photo of Takao Harbor taken by the USAAF in 1944. For the ease of comparison, the original reconnaissance photo is shown at the bottom.
It is clear from the photo that, by 1944, numerous buildings had been erected on site of the so-called current airdrome. Also, a canal had been dug, cutting through the site of the substitute airdrome. Most important of all, the planned new airdrome had never been completed.
Source： NARA via Fold3.com
So, what had happened between 1934 and 1944? Was the substitute airdrome ever completed?