Exactly right . The old Pt6 is a trusted and reliable beast. If...

Exactly right .
The old Pt6 is a trusted and reliable beast. If I know anything in aviation. It takes a long and difficult time to get anything certified .

I think going forward oil will always be the transportation fuel of choice for a long time. which is good thing for companies like Ptb.
Having saying that aviation companies have partnering with fuel companies to emprove fuel and different alternatives to jet a1 ( kerosene more or less) to improve efficiency and environmental concerns.