Delta cancelling nearly 250 more flights

Delta's travails, and those of its customers, move into day two with the airline cancelling nearly another 250 flights.

The cancellations on Tuesday follow about 1000 cancelled flights on Monday and almost 3000 delayed flights after an outage at its Atlanta headquarters initiated a global meltdown of its booking and communications systems.

The airline was back online after a number of hours on Monday, but the outages were so widespread that it is still dealing with the ripple effects a day later.

The airline posted a video apology by CEO Ed Bastian. And it offered refunds and $US200 in travel vouchers to people whose flights were cancelled or delayed at least three hours.