No go mate.It has become a bit of a nightmare especially if you pass through USA gateways and you are flying AA.
No padlocks unless TSA security approved so they can unlock them.It all went bananas post 9/11.They will often open a case screened with a tube inside it even if it does look like a fly rod inside.Rule of thumb in USA just stay calm or it just gets worse.
I travelled to Pacific/Cortez Mexico quite a lot and used to take quite a bit of gear but it became more and more tedious.Have to say we never actually lost any gear but sometimes it went on a trip of its own and arrived later.Transiting via USA gateways you have to collect your luggage and re-check it.Not as bad as it sounds but still a nuisance when you once could check it all the way through from your point of departure.
My advice is check up on everything and then do another check of all the current legislation because it changes like our weather.
Really no wish to cast doom on you but go in with your eyes open on all fronts and you will most likely have no issues.Leaving it to chance is a recipe for disaster.
Used to be a doddle but no longer I am afraid.Guess the bogey man is happy as the costs of it all are astronomical.
Have a great trip & good fishing

. JP