[6][7] The company developed the Bye Aerospace Sun Flyer, a modified PC-Aero Elektra One, as a prototype electric aircraft in 2015.

[8][9][10] The development of the Sun Flyer 2 was originally carried out by a Bye Aerospace subsidiary, called the Aero Electric Aircraft Corporation.

[18] On July 31, 2018, Bye Aerospace flew a piloted prototype of its solar-powered unmanned StratoAirNet and manned Solesa from the Northern Colorado Regional Airport.

Based on a carbon fiber composite competition sailplane, it has a 15 m (49.2 ft) wing span and thin-film photovoltaic cells from SolAero Technologies.

The low-cost, long-endurance commercial and government surveillance aircraft could be used for patrol, mapping, precision agriculture or search-and-rescue and has low infrared and acoustic signatures.

[22][23] After the project was revealed as under development in June 2020,[24] Bye Aerospace officially announced the eFlyer 800 in April 2021, to be powered by Safran electric motors.