+1
Hope you don't mind me going on (but I like to analyze these things)...
On the comedy dynamic: with Martin & Lewis movies it was usually a brotherly type relationship, with Dean acting as the older brother watching out for his somewhat dimwitted, hyperactive, naïve and child-like charge (Lewis).
But in Boeing Boeing the relationship (or team, if you will) has a completely different dynamic.
There's really no straight-man / comic-relief set up. Both characters seem equally sophisticated (and thus adept at scheming or aiding & abetting scheming). They are somewhat similar characters - both jet-setting playboy types. Thus their friendship seems much cooler (less intimate) than the old Martin & Lewis scenarios. These guys seem more like associates who get caught up in each other's schemes than they do close friends.
That's why this film is atypical, character-wise, for Jerry Lewis, while Tony Curtis has played very similar "shallow & scheming" characters in many of his movies.