What is the risk of a repeat of Helios Flight 522?

One of the problems that led to the accident was that the crew disregarded the cabin altitude warning horn, thinking it was the takeoff configuration alert. read more

But AFAIK the 737 series still have the same warning for the TOCWS and cabin excess altitude warnings, so potentially there could be a Helios 522 repeat, but since CRM (Crew Resource Management) and SOPs (Standard Operating Procedures) are better than ever, this is highly unlikely. read more

Helios flight 522 was flying from Cyprus to Athens. The crash of the plane was the deadliest aviation accident in the Greek aviation history and was the result of a chain of events gone devastatingly wrong. read more

The fact that one of the flight attendants was in the cockpit a couple of times, and apparently on portable O2 for possibly 3 hours (according to the Nat Geo TV report) is unfortunate. All that had to be done was an emergency descent. read more