Portugal has signed an amendment to its contract with Embraer, securing a sixth KC-390 Millennium transport aircraft and creating 10 new purchase options for potential acquisitions by allied nations. The Portuguese Air Force, which introduced the KC-390 in 2023, is now the first operator worldwide to expand its initial order. The deal formalizes an intention announced at the Paris Air Show in June 2025, when Lisbon revealed plans to add a sixth aircraft and open option slots for NATO partners. Portugal was the first European customer of the KC-390 and has been a core industrial partner in the program since its inception. It can also be configured for air-to-air refueling, either as a tanker or as a receiver from another KC-390, giving NATO operators greater flexibility in joint operations.