What happened if you cancel every contract offer

Does the contract has limit based on airport on the map, or does it generate new contract after every one hour?
Will it ever stop generating contract?
Screenshot_2023-10-11-23-24-31-78_b73c89205deb9271ede7b48d9743ced8

No it will keep generating, I guess until you buy all the local contracts

Or you run out of silver planes (likely to be sooner)