Accrue a few billion for refunds, depreciate your software to zero, and start to set aside a few billion for new cloud whatever.
Basically, take this as a huge loss and communicate that you’ve lost a lot of goodwill and trying to make passengers whole is #1 priority (after safety, of course).
https://www.forbes.com/sites/advisor/2020/07/15/how-airlines...
And loyalty programs are bigger business for the higher end airlines that cater to business travels and the more affluent.
On top of that, the top 3 airlines make a lot of money off a first class and business travelers who are using other people’s money.
If they have operating income of eight to ten billion a year, spending a third of a billion to upgrade systems seems like it would have been a reasonable investment instead of buying back shares and increasing the dividend.
Then next earnings release - when they post shareholders profits - that’s exactly how much they were willing to hold back to fix this, trading profit for people stuck for days.