It makes sense when you can order limited number of A/C per week, because you need staff to do the paper work and everything else to get the A/C
What I propose is that, we should have an option of "holding" an A/C for a period of time, with a fee less than the leasing, of course. Then, we need another option to schedule ahead what will be done. For example:
Week 1: you ordered 2 A/C, and reach the limit. You can then put an/some A/C on hold with, say 50% cost of leasing, for X number of weeks
Then, you schedule the leasing of those A/C to be done on week 2, 3, etc...
So, when you log in 24h real time later, ~6-7 week game time, you have a fleet of 12 more A/C or so, instead of just 2