A Ryanair Boeing 737 Next Generation jet made an emergency landing at Thessaloniki Airport in Greece early Friday after a cabin window dislodged at 16,000 feet, partially ejecting a 61-year-old Serbian passenger who was wearing his seat belt. The man's wife held his legs while other passengers pulled him back inside the cabin before pilots abandoned the climb and returned to the runway. Emergency responders met the aircraft and the passenger survived, according to an airline spokesperson.

The aircraft involved has been in Ryanair's fleet since 2008, making it a 737NG model rather than the newer MAX variant that has faced intense scrutiny. Investigators have not determined what caused the window to fail, though the incident adds to a string of structural and quality-control issues plaguing Boeing's narrow-body programs.

For investors, the episode reinforces concerns about Boeing's manufacturing oversight just as the company works to restore regulator and airline confidence after the 737 MAX groundings and recent door-plug blowout. Ryanair, Boeing's largest European customer with hundreds of 737s on order, faces potential reputational risk though its shares showed limited immediate reaction.

The incident's market impact will hinge on whether investigators find a systemic maintenance lapse or an isolated failure — a distinction that could determine if regulators mandate fleet-wide inspections that ground aircraft and disrupt summer schedules.