Avgas is also much more expensive than kerosane. > That may be so, Alireza, but radial engines are just about the biggest > maintenance nightmare in the history of internal combustion. There's a > reason all those Constellations disappeared so fast when jets came on the > scene, and a reason prop powered airliners are all turboprops now, and its > not just passenger opinion. > > Evan McElravy > > > > on 11/26/03 2:48 AM, Alireza Alivandivafa at DEmocrat2n@xxxxxxx wrote: > > > In a message dated 11/25/2003 3:39:57 PM Pacific Standard Time, > > damiross2@xxxxxxxxxxx writes: > > > > << The operating costs are not necessarily higher. While an older aircraft > > may consume more fuel, it also depreciated so the capital costs are less. Why > > do you think so many older aircraft are converted to freighters? >> > > > > Also, old piston craft use much less gas than jets. If you are using them > > for short flights and tours, that wont go much above FL200, they are fine for > > economy