UNITED Airlines bosses were forced to ground its fleet of planes across the US on Wednesday sparking travel chaos for passengers.

Ground stops were ordered at major airports including Houston, Newark, and San Francisco.

Planes were grounded over a technology issue.

Problems started to arise just before 6:15pm ET.

Around three in 10 of the carrier's flights were delayed by around 9:45pm.

The issue was eventually resolved, but chiefs warned travelers to expect delays.

"Due to a technology issue, we are holding United mainline flights at their departure airports," a spokesperson told Fox Business.

"We expect additional flight delays this evening as we work through this issue.

"Safety is our top priority, and we’ll work with our customers to get them to their destinations."

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