Delta passengers want reimbursement for missed trips following tech outage

A global tech outage led to thousands of flight cancellations after a faulty update affected Windows systems. Delta faced criticism for its handling of refund requests, with passengers alleging that the airline refused automatic refunds and only offered partial reimbursements in some cases.

What was the duration of the global tech outage mentioned in the text?

What do passengers claim about the refunds offered by Delta?