A Ryanair flight from Thessaloniki to Memmingen returned to the Greek airport after a Boeing 737 NG window dislodged a few minutes after take‑off, nearly ejecting a passenger. Witnesses said the breach resulted from a detached engine part striking the window.

Boeing has acknowledged the incident and is in contact with Ryanair. The 737 NG, delivered in 2008, is powered by CFM56 engines. Boeing has opened a fourth assembly line near Seattle, raising output from 42 to 47 aircraft per month. The company’s CEO, Kelly Ortberg, says the move stabilises production.

Shares reflected the event. Boeing’s stock fell about 1 % on the New York exchange, while Ryanair’s stock edged up roughly 1 % in Dublin. The swing underscores how single incidents can move investor sentiment, especially for carriers with tight margins and high operating leverage.

The episode highlights the importance of rigorous component inspections on the ageing 737 fleet. Regulators and maintenance providers will likely tighten oversight, potentially increasing operating costs. For investors, the incident signals a risk that could affect future earnings and fleet renewal decisions.