Charging MacBook air
I do not have a charger for my MacBook Air and I don’t know if there’s anyway I can charge it with my iPhone plugged up to the USB cord into the MacBook
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Sorry, there isn't an option to charge your MacBook Air from your iPhone.
If you need to buy a new power adapter for your MacBook Air, the following may help: Find the right power adapter and cable for your Mac notebook - Apple Support