Cessna is claiming two speed records for the Citation X business jet after its 11 May "bicoastal" run. The aircraft was flown from Teterboro, New Jersey, to Van Nuys, California, in 4h 49min, an average true-airspeed of 448kt (694km/h); and from Van Nuys to White Plains, New York, in 4h 10min, an average of 525kt.
Source: Flight International