The terrifying mid-air drop that left at least 50 people injured on a Latam Airlines flight from Sydney, Australia, to Auckland, New Zealand, was likely caused by an accidental bump in the cockpit. US industry officials who were briefed on the preliminary evidence from the investigation of the Monday incident tell the Wall Street Journal it appears a flight attendant was serving a meal when they hit a switch on the pilot’s seat, which in turn activated a motorized feature that pushed the pilot into the plane’s controls, causing the plane’s nose to be pushed down. Per an aviation industry repor…