Flights from HK to London don't pass over USA, so 12 to 14 hours detour for maintenance is unthinkable.
When the hospital doctor is administering the antiviral, she gives it into the bicep and the antecubital area. Shots, like antivirals, are given into the deltoid muscle or the glutes.
Shaw suggests changing "even just one variable" in their fight against Samaritan. The Machine in running simulations of possible outcomes (which according to visuals numbers in the hundreds of millions) in the conflict between these two (2) AI systems. The one thing they could have done is taken computer records of these simulations and have The Machine (the "good AI") analyze the transcripts/ records of these simulations and give a report as to why so many simulations were failures.