
Here we are, 41,000 feet in the air, sailing along at a little more than 476 knots and a little more than halfway from Morristown, N.J., to the Paris Air Show. We’ve got a biofuel blend of Honeywell’s finest and jet-A feeding engine one and straight jet-A in the other. The G450’s Rolls-Royce engines appear to be perfectly happy on a diet of either, and the flight is as smooth as a glass-top table.

