What you describe is the process of buying a laptop on Ebay.

When you buy a plane, perhaps you have already payed months ahead, perhaps you'll pay five years later, perhaps you pay on a monthly basis, perhaps you don't pay at all but transfer the rights do to something

it is all contractual obligations, sometimes money does not even trade hands

etc.

the idea that you would need to wait for a bank to open to transfer money while watching the timezones is completely unrealistic