Hi,
I was just looking at another airline in my world, which is currently in the year 2002, and I was interested to notice that they are operating around 150 De Havilland Comet 4Cs, and 350-ish 707-330Cs. While they are both amazing planes, they must be at least 25 years old, and there is no way that any modern country would allow them to operate, especially America, where the airline is based. Are there any plans to introduce a system that would not allow an airline to operate planes over say 20-25 years of age? Or something of the type?