The first Boeing test flight of ZP801 is symbolic milestone for the RAF Poseidon force

P-8A Poseidon RAF on Twitter: "The first @Boeing test flight of ZP801 is symbolic milestone for the RAF Poseidon force. There’s more in the @RoyalAirForce news article. #21stCenturyRAF #ItsComing https://t.co/qyqV3GORFf… https://t.co/v2RgGOEL8u": 

Images show the first British P-8 Poseidon painted and on the flight line undergoing pre-flight preparations for its first flight
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P-8A Poseidon: Details