Hey, I made an airport in sandbox mode, and I realized that it takes ages if you want to build a huge airport since you only have 50+ workers from the first contractors.
Therefore am I requesting more builders in sandbox mode, ideally it would be up to 1000, but that may be too much lag, so I would have gone with 500.
The reason I want it is because I want to speed up the process when building big airports from the start.
Example of it taking much time: I’ve used 3 years on making one airport and it is not even finished yet
As a partial solution you could download the mod “Real Contractors by Dubinek” from STEAM workshop.
It has companies of up to 5 stars giving you up to 150 contractors (A little tip: If they do not offer 150 workmen decline the offer and wait for a new one to get more contractors).