British Airways Chief Executive Alex Cruz on Monday denied union accusations that a massive computer failure that forced the cancellation of an estimated 800 flights was caused by staff redundancies and the transfer of IT work to India.
In a statement the airline said that a full schedule of flights was running from Gatwick and they meant to operate a full long-haul schedule and a "high proportion" of its short-haul programme at Heathrow. Renewing IT systems is complex, time-consuming and expensive - a factor that prompts many companies to put it off as long as possible, said Loizos Heracleous, a professor of strategy at Warwick Business School.
"We will make sure that nothing like this ever happens in British Airways again".
"Apologizes all well and good but not enough".
The disruption brought down the airline's systems handling flights, bags and customer communications - and a back-up system failed to kick in.
Shares in IAG, which also owns carriers Iberia, Aer Lingus and Vueling, fell more than 4 percent in early deals on Tuesday, the first day of London trading after the holiday weekend. The London-listed shares did not trade because of a public holiday.
He revealed BA is operating more than 95% of its flights on Monday, with all of its Gatwick services and long-haul flights from Heathrow going ahead.
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The spokesperson added that flights for bookings under 50kg were opened on Sunday, with more opened on Monday.
Others blamed BA's recent series of cost-cutting measures, created to keep the company in competition with budget airlines such as Ryanair and Easyjet.
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The British union GMB linked the IT problems directly to the company's decision to cut IT staff past year.
"This could have all been avoided".
The GMB trade union blamed it on outsourcing of computer jobs to India past year.
Cruz rejected the union criticism. "They have all been local issues around a local data centre who has been managed and fixed by local resources", he said.
Many passengers had to leave without their luggage, amid complaints about a lack of information. Others said their luggage had been lost. The trouble is expected to land the airline a sky-high bill.
Last month, Germany's Lufthansa and Air France suffered a global system outage which briefly prevented them from boarding passengers.