But New England recently partnered with SessionM, a tech startup that helps increase user engagement, to turn that app into an engine of fan involvement and interaction.
One way to increase the efficiency of a high-bypass jet engine is to turn the fan into an open rotor, a bit like returning to propellers, but using two rings of stubby counter-rotating blades.
As for the other incidents that have beset the type over the past few months -- a fan shaft failure on an engine, an oil leak, a windshield crack -- all can safely be put down to teething problems.
By contrast, the engine designs for a putative Concorde 2 had a revolutionary double-fan arrangement that would have gone a long way to cutting the noise.