Emirates Airlines unveiled the first class suite on board of its newest Boeing 777-300ER aircraft - with virtual windows. These displays are connected directly to cameras outside the aircraft but can also show other images. This has several advantages - images can be tailored to help combat jet lag, the plane can be lighter, stronger, faster and more efficient. It is not entirely clear, but it is reported that the Emirates is using OLED displays.
The idea of using virtual OLED displays instead of aircraft windows has been discussed several times before. The aerospace industry has been slow to adopt OLEDs - the first application was Bombardier's nice Touch cabin management system on Lufthansa Technik's Global 7000 business aircraft, which uses a dial with a small OLED (probably PMOLED) display. The system was announced in May 2018.