United Airlines was forced to issue a ground stop for all flights nationwide due to a technical issue with its weight and balance computer system Wednesday evening. "Due to a technology issue, we are holding United mainline flights at their departure airports,

United Airlines ops being grounded is the latest problem to hit the US aviation sector, after the IT snafu last month, which grounded Alaska Airlines flights.

United Airlines flights on major routes were grounded Wednesday because of a technology issue, and additional flight delays were expected into the evening, the airline said.