US airline Delta has cancelled at least 300 more flights after a power cut on Monday that resulted in the cancellation of 1,000 flights and delays for about 2,800 more.

The company has not yet given details about the financial damage. But correspondents say it is likely to amount to millions of dollars. The meltdown exposes vulnerabilities in Delta’s computer system, which is over-reliant on IT systems that date from the 1990s, correspondents say.

Although the airline was back online late on Monday, it was still dealing with the knock-on effects a day later.