, i kind of doubt planes will need a shitload of space to land. maybe 10 blocks at most. Liek boats that you can stop instantaneously and minecarts. Idk, it seems more minecrafty that way.
Flans planes took around 20-30 blocks to stop, and even more to take off.
An airstrip length of 100 blocks seems reasonable. I don't know if (I forget his name, the guy whos working on it) took inspiration from Flans planes or not, but considering those are based on real life planes (I think? Are they?), it would make sense.
Also, boats don't instantaneously stop unless they hit something solid. If you're going slow, then yes it'll stop quickly, but if you're going fast, it'll take some seconds.
I'm trying to see how many meters landing strips for small planes (propeller planes, not jets, I don't think the planes in MC will be going THAT fast), but 100 blocks minimum seems reasonable.
Edit: Correct me if I'm wrong, 1,000 blocks is 1,000 meters, right? Just asking.