United Airlines briefly grounds all flights across U.S. and Canada

All United Airlines flights departing in the U.S. and Canada were briefly suspended Tuesday night, as the airline asked the Federal Aviation Administration to issue a ground stop over an unspecified technological issue.

United, which grounded its flights for about half an hour, said it had "experienced a brief connectivity issue just before midnight Central time on Tuesday, but has since resumed normal operations."

It was the second time in less than two months that the U.S. airline had requested a halt to its departures over an unspecified technical glitch. In early August, United flights were subjected to ground stop across major U.S. airports including Newark, Denver, Houston and Chicago, which lasted several hours.

The airline said at the time that it was a "technology issue," which caused widespread delays throughout its network.