Nearly a week after a computer glitch grounded hundreds of its planes, American Airlines has yet to disclose the exact cause of the problem that frustrated passengers stuck in crowded terminals across the country.
In a video apology, Chief Executive Tom Horton said only that "we had a software issue that impacted both our primary and backup systems."
But as airline computer systems become more interactive and complicated, computer experts warn that outages may become more common if airlines do not regularly test and maintain their systems.
"We are pushing the limits of human capabilities with these things," said Bill Curtis, senior vice president and chief scientist at Cast, a software analysis and measurement company in New York. "What’s happening is these systems have gotten larger than any single person or single team can handle."