for the base right they didnt say anything about the distances but since they talked about it and judging the fact that they had to finish that airport to start the whole operation my guess is it at least was close enough for those aicrafts that cannot operate off of carriers to be in range and be able to reach just fine, its been a while since i read this manga so i might be wrong...This is like the 3rd or 4th time I've had to say this, and I'm really getting tired of repeating it - especially when the last time was only a few posts before this, but Japan has no aircraft carriers. They have helicopter carriers. Fixed wing aircraft can not operate off of them. Literally none of the fixed wing aircraft, which is all the aircraft you're seeing, can operate off of carriers, let alone Japanese carriers.
And I already addressed the craters because if you look you'll see craters where there are visible stilts being used. There's craters where there's parts of the deck are on stilts. Meaning that the ground is not going to be directly under the deck.
And as for this base: do you know how close that is? Because I don't. Manga doesn't say it, either. So how do you know?
And for someone telling me to read carefully, you and like about a half dozen other people that had to be corrected forgot that those are NOT troop transports and they are BOMBERS and a previous chapter takes several pages explaining this.
So you can stop with the "u need to read carefully" nonsense.
i also somehow got the wrong idea that those bombers were carrying troops / paratroops my bad on that anyway i just did some checkings on the maps compared it to the size of japan and the distance should be roughly between 600km to a 1000km from that new built airport which should be no problem ope from, but again i mighty be wrong i also couldnt find a proper map and too lazy to recheck the map on the manga