"Guesswork and denials aside, one commentator believes he can explain contrail-less military aircraft. David Hambling, author of Weapons Grade, says that the technology for reducing contrails has been available for some time. He refers to a technology called "plasma aerodynamics," that was first developed and researched by the Russians. The interest shown in plasma aerodynamics by military agencies worldwide lies in its alleged stealth capability. "The USAF appears to have been using plasma aerodynamics for decades. The Russians certainly know all about it, as does anyone who has bought the technology off them," says Hambling. "According to the patents, it has additional benefits too - it can muffle the noise produced by engines as well as preventing contrails from forming. The only people not enjoying its benefits are the civilian taxpayers who funded it in the first place." The other link has some orb stuff on it