Gulfstream Aerospace G-V, HB-IMJ, funny call signed "Batman 164", took off at the Airport Bern-Belp in Switzerland. This Aircraft belongs to the VIP charter flights operator G5 Executive LTD. The friendly First Officer waved his hand to me while he was probably working through the last points of the take off checklist. Enjoy the awesome engine sound especially when the aircraft starts its turn on the runway.