Rising more than 18% in mid-day trade Friday, Joby Aviation (JOBY, Financial) shows a 17.3% increase over the previous month and a 92% rise over the past six months. Notwithstanding this progress, the electric vertical takeoff and landing (eVTOL) pioneer still struggles to reach its market potential.

Along with relationships with Delta Air Lines (DAL, Financial) and Toyota (TM, Financial), the company's $131 million Agility Prime deal with the U.S. Department of Defense highlights its long-term prospects. Nonetheless, Joby's premium value is increasingly challenging to support while rivals like Archer Aviation (ACHR, Financial) are showing greater growth numbers and insider confidence. Archer's development has drawn investors looking for more dependability in the developing eVTOL sector.

Joby is growing operations worldwide and almost reaching Federal Aviation Administration accreditation. Still, a major challenge for scaling its company is Analysts believe that until Joby shows consistent revenue and operational performance, investors can discover more quick chances in rivals.