F-22 and F-35 Aircraft Finally Talk Stealth to Each Other, U-2 Spy Plane Helps 4 May 2021, 8:47 UTC · by 1 photo The latest flight test, dubbed Project Hydra, used an Open Systems Gateway (OSG) payload aboard the U-2 to link an F-22 to five F-35s through an Intra-Flight Data Link (IFDL) and a Multifunction Advanced Data Link (MADL). The demonstration made it possible to exchange data in free flight between all aircraft and ground nodes. The Airforce has been trying over the years to develop a new technology that could make this type of communication possible. Up until recently, the F-22 couldn't transmit stealthy data to any aircraft besides other F-22s. The F-35s also couldn't communicate with the F-22s except at the voice level. All because each aircraft used different Low Probability of Interception (LPD/LPI) communications.