Delta reigns supreme as the most on-time US airline. Here's how its rivals compare.

Delta reigns supreme as the most on-time US airline. Here's how its rivals compare.

Brandon Bell/Getty Images

Despite a chaotic CrowdStrike outage that forced Delta Air Lines to cancel some 7,000 flights over five days this summer, the Atlanta-based carrier retained its title as the US' most on-time airline.

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