I just read the news of a new airport in construction in Mexico (Mexico City). They seem to be starting operations in a few months.
In this case, researching a bit, it seems domestic and a Venezuelan airline already had flights to and from that location, and I think only Aeromexico refused to change the hub.
I don't know if the airlines are fined or issued an admonition for landing in a aerodrome/airport, AFAIK without certification. IMHO, this is risky thing to do. It reminds me of HKG being transferred from Kai Tak to Chek Lap Kok, but it was a smart idea since the former HKG was amidst a tall buildings zone. In the case of Mexico's new terminal, there does not seem to be a practical reason to make a new one in the area.
So it makes me wonder: How is a new airport certified by ICAO/IATA/EASA/FAA?
Researching a bit more, this new airport was done scrapping a former project to build terminals 3 and 4 on the actual MMMX (I don't understand Spanish that well, but there is allegiance to turmoil rubbish to do so). The navigability studies were made by NAVBLUE.
And this is an already in operations air force base with a number of operations of that is been retrofitted to admit commercial planes, Thus it makes me more curious to my question.