Mr A Tis
Consider this:
You see, on 3 consecutive days, a:
1) Bentley Mulsanne;
2) BMW M5 and;
3) Skoda Fabia.
All these cars are broken down, by the side of the road. The cause is fumes in the passenger/driver cabin. All of them are of different ages and vintages.
Do you think all 3 cars have the same "common" components?
Or is it a case of bad luck?
You mentioned 747, 777 and A320's.
I'd say it was more bad luck, wouldn't you?