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X-Plane 10 LAPCAT-A2 HyperSonic Airliner. A flight from London to Sydney (as of 2015) on Qantas takes 21:55 hours. On the LAPCAT A2 HyperSonic Airliner, the same flight would take under 4 hours at 65,000 feet and at Mach 5.00. LAPCAT: Long-Term Advanced Propulsion Concepts and Technologies. This model as built in X-Plane, has a maximum climb rate in excess of 90,000 fpm! Full description, links and noted included. By Billy Bargagliotti.