#4
I have 3 SKB cases, I switched the lockable latches so 1 has 3 the others don't.

I wasn't really concerned for security cause TSA can open those but I was more concern with the other ones accidentally poping open. Id put some bubble wrap in the empty parts of the cases to make sure it can't slide around.
#5
Yes. Some air companies let you carry the guitar onto the plane, but you should definitely inquire before hand.
Ibanez PGM301
Ibanez GRG170DX
Fender Telecaster MiJ - 1986
Swing T-Through

Ibanez TS9DX
Sovtek Small Stone - c.1985
EHX Big Muff
Kimbara Wah - c.1974
Boss GE-7

Orange Rocker 30 Combo

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#6
It should be fine, i flew from New york to London with my guitar in the hardcase and it was ok.
#8
my guitar's a music man john petrucci signature. the case's music man as well. but the latches can't be locked. wonder if i should tape the case in loops.