This is almost thread drift as Covid is the immediate problem but ... A good friend of mine was on a long term contract for BA developing software when it was all outsourced. It is a long and painful story. For myself, I was in Telecommunications and IT for 27 years and saw the start of the outsourcing game / fashion in New York in 1987/88. I did not like it and have never liked it. Call me old fashioned but I quote my father who was in Personnel Management (before it became Human Resources) and then in a specialist agency recruiting 'C' level staff and their close subordinates.
In his retirement when I discribed outsourcing to him he said: "Unless you have control over an employee's salary - you have no control." He also quoted the famous line "You need to be able to reach out and grasp someone warmly by the throat ..." The outsourced employee is not answerable to the client - but to their own manager who has the money.
I agree with those (above) who state that the refurbishing of the software suite at BA is a mammoth task and better to be dealt with by Main Board directors who actually understand IT and not put out to big consultancies. This process will take years but, as far as we know, IAG has not yet started. I DO UNDERSTAND the cost of this and the difficulty of doing so post Covid but - they should have started it five years ago when the weakness of their systems was becoming apparent.
Many senior company people in the UK do not understand that they are an IT Company who happen to: Make Baked Beans / Paint / Cars or operate aircraft for pax and cargo. The IT enables everything. I have seen at first hand, large UK companies fail to understand this.