Japan's Mitsubishi Aircraft Corp on Monday said it had signed a letter of intent for orders of its new regional passenger plane with Swedish leasing company Rockton, in what would be its first European sale. The deal is for 10 firm orders with an option for an additional 10 and the two companies said they expected a definitive agreement "in the near future" in a statement on the sidelines of the Farnborough air show, south-west of London. Deliveries are set to begin in 2020.