Regions of outbound data transfer?

According to Fly App Pricing · Fly , price of outbound data transfer from different regions vary.

But what define regions here?

  • FLY_REGION set in flyctl of each app?

or

  • regions where the data receivers in?

We charge for bandwidth from the VMs themselves. So the regions flyctl status shows.

Thank you for your answer. It should be right.
But where about India referred in Fly App Pricing · Fly ?
Already checked Regions · Fly , but there’s no region in India…

Oh! Servers in India aren’t yet generally available, but you will be able to choose India as a region sometime this year.

Looking forward to this. However, is there a reason outbound prices are 6x higher for India?