N825MH, a Boeing 767-432ER operated by Delta Air Lines, experienced a windshield issue two hours into flight DL4 at an altitude of 34,000 feet. As a result, the aircraft had to divert over the Atlantic Ocean and land at Shannon Airport (SNN). According to various sources, including Irish claire.fm, emergency crews were on standby due to potential issues such as brakes overheating with the 25-year-old Boeing 767-400ER.
The Aviation Herald reported that N825MH was cruising at 34,000 feet when the windshield began overheating. An overheated windshield poses risks of cracking or shattering, which could lead to depressurization and deprive passengers of necessary oxygen.
In response to this risk, the pilots descended to 10,000 feet—a standard protocol for potential depressurization scenarios. This altitude helps mitigate severe medical issues related to hypoxia.