The trial flight finally started on 4 August, when LZ 4 lifted off at 06:22 in the morning, carrying 12 people and sufficient fuel for 31 hours of flight.
試飛最終於八月4日開始，當時LZ 4在凌晨六點二十二分起飛，載有12人和足夠的燃料，共飛行了31小時。