Boeing executives have admitted they cannot promise that another incident where a plane door plug blows out mid-flight will “not occur tomorrow” as they were forced to give testimony this week following a string of safety scandals. The US National Transportation Safety Board (NTSB) held a two-day investigative hearing beginning on Tuesday concerning the near-tragedy on Alaska Airlines flight 1282 on January 5 which sent shockwaves through the aviation industry. The aircraft’s door plug - a self-sealing wedge-shaped door used on pressurized cabins - blew out while the 737 Max aircraft was cruising at 16,000 shortly after departing from Portland, en route to Ontario, California.