By Anica Padilla

(CBS4)United Airlines has made another investment in electric aircraft. United is working with electric aircraft startup Heart Aerospace is developing the ES-19, a 19-seat electric aircraft capable of flying up to 250 miles using only electric motors and batteries.

Electric aircraft ES-19 (credit: United Airlines)

READ MORE: United Airlines Announces 3,000 New Denver Jobs, 270 New Aircraft On Order

United Airlines has conditionally agreed to purchase 100 of the electric aircraft, once they meet safety, business and operating requirements.

Once in operation, the aircraft could operate 20 to 30 routes departing from Denver to destinations such as McCook, Nebraska.

They hope to have the aircraft flying passengers before the end of this decade.

Electric aircraft ES-19 (credit: United Airlines)

The deal is in collaboration with Bill Gates’ Breakthrough Energy ventures.

Anica Padilla