This is not a drill, though it may be an April Fool’s joke.
Virgin Atlantic announced today they will debut a plane with flapping wings that will generate its own power and allow cruising speeds of up to 900 mph, starting in 2019.

Screenshot from virginatlantic.com
The debut route in 2019 is slated to be London to Seattle.
Check out the announcement page here.
*Update 4.1: Virgin Atlantic has now announced that they were lying:
You never know! Might happen someday! #aprilfoolsday https://t.co/Ly9VZImEnH
— Virgin Atlantic (@VirginAtlantic) April 1, 2017
Very funny. Not cool.