The 'ionBird' test aircraft will be used to crack speeds of over 300 mph (480 km/h) in late Spring 2020
The plane is called the 'eBeaver'
Passengers on-board select BA117 flights from London to New York's JFK will be trialed initially
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The test will start with two US airports
The aircraft are grounded following two crashes
Limited test will run in select flights for two weeks
Assistant continues to improve