PPP stands out for Purchasing Power Parity. Flight Levels Academy (FLA) offers adjusted fair pricing based on where you live. Different countries in the World have different regional economic situations, so purchasing power is different as well. What is the normal price for somebody in the United States, might be too much for somebody from a different part of the World. So, Purchasing Power Parity is here to address that. Basically, all countries are split into different groups to adjust all prices of FLA.
So, your price depends on which country you live in (be a tax resident of). If your company is paying for you, then the country that I would send an invoice to.
Tier 1 countries, PPP=1.0
Switzerland, Germany, Austria, Finland, Norway, Sweden, United Kingdom, Canada, United States, …
Example ticket price: 1900 EUR
Tier 2 countries, PPP=0.8
Italy, Spain, Portugal,…
Example ticket price: 1520 EUR (1900 EUR * 0.8)
Tier 3 countries, PPP=0.6
Estonia, Latvia, Lithuania, Poland, Slovakia, Czech Republic, Croatia, Greece, …
Example ticket price: 1140 EUR (1900 EUR * 0.6)
Tier 4 countries, PPP=0.4
Ukraine, Georgia, Kazakhstan, Armenia, …
Example ticket price: 760 EUR (1900 EUR * 0.4)
You can also check all possible countries on the page about Purchasing Power Parity at Flight Levels Academy.