Easy. Put outlets around airports with like small vending machines with a two dollar fee for a 10 minute charge...
If they end up doing this, I’m hunting you down.
A local mall here has a “free”* phone charger kiosk. You select a code, open a compartment, insert your device (plugging it into the appropriate wire), and go shopping. Come back later, an outside indicator will show whether your device is finished charging. Enter your code, the compartment opens, and away you go!
*Of course it’s not “free”. TANSTAAFL. It’s paid for by the mall on the theory that users are spending money in the mall’s tenant stores. There is no demand or provision for payment at the kiosk.