American added that it had paid a non-refundable deposit on the initial 20 aircraft, but did not disclose the size of the deposit.

Boom's Overture jet is expected to carry passengers at twice the speed of the fastest commercial aircraft available, the company said.

The jet is scheduled to roll out in 2025 and carry its first passengers by 2029, Boom added.

(Reporting by Nathan Gomes in Bengaluru; Editing by Vinay Dwivedi)