Regarding whether it is possible to use Silver Airplane Coin to buy contracts permanently

Now I have 416 contracts at LHR, but I still feel it is not enough. So if it’s possible that we can use Silver Airplane Coins to buy contracts in the store without waiting for 48 hours?

Unfortunately you have to wait the set hours after each purchase so all you have to do is be patient.

You can buy as many contracts as you want from the map but they cost wollars and silver planes