SAO PAULO (Reuters) - Electric aircraft maker Eve has signed a letter of intent with Japan's public helicopter charter service company AirX to sell up to 50 electric vertical take-off and landing (eVTOL) aircraft, it said on Wednesday.

Eve, which is controlled by Brazilian planemaker Embraer, said the letter includes a firm order for 10 eVTOL and an agreement involving other potential 40 units.