Delta announced via its website that a ground stop imposed early Monday has been lifted and that “limited departures” are resuming, adding that delays and cancellations are possible.
The US company has confirmed some flights are now taking off after a power outage caused its IT systems to crash, leaving passengers stranded at airports around the world as scheduled flights were not taking off.
It confirmed the news on Twitter: “Delta ground stop has been lifted & limited departures resuming following power outage in ATL that impacted Delta computer systems.”
In a statement, the airline said customers should still expect delays and cancellations because of the more than three hour halt caused by a computer breakdown at its hub in Atlanta.
.@Delta ground stop has been lifted & limited departures resuming following power outage in ATL that impacted Delta computer systems (more)
— Delta News Hub (@DeltaNewsHub) August 8, 2016
The firm also said there may be some lag time in the display of accurate flight status and that a travel waiver for customers travelling today through to 12 August is in effect.
Frustrated passengers stuck in check-in queues at airports have been expressing their outrage on social media.
Jake Chen tweeted: “1 hr.+ lines @HeathrowAirport for @Delta due to system outage oldschool manual ticketing.”
— Jake Chen (@MITJAKE) August 8, 2016
Amanda Jackson said: “Chaos trying to check in @Delta Heathrow t3. Been in queue for 1.5 hours. You seriously need to open more desks to overcome technical hitch.”
Blue Stone tweeted: “Delta lines backed up and not moving” as lines to check-in snaked through the terminal at Baltimore Washington International airport.
Customers are still being advised to check the status of their flight before heading to the airport.
— BlueStone (@bluestonephoto1) August 8, 2016
A Heathrow spokesman said: “Check-in is currently operating using a backup system and airport staff are on hand to assist any passengers that are impacted by the delays.”
A Virgin Atlantic spokeswoman said their flights were departing as normal, but that some of their customers could be “booked on a codeshare ticket” with Delta.
The spokeswoman added: “If so, customers should check the status of their flights.”
The airline began in 1924 as a crop-dusting operation. It now serves more than 160 million travellers, according to its website.