Mon, 01/08/2024 - 23:44 Tech Insider The NTSB is leading an investigation into an Alaska Airlines jet that lost its door plug while thousands of feet in the air. The plane was a Boeing 737 Max 9.@strawberrvy via REUTERS // Stephen Brashear/Getty Images Tags Transportation, insider-news, 737-max, Boeing, alaska-airlines, FAA, NTSB Source The 737 Max is Boeing's best-selling jet — and in recent years, one of its dead…