I just returned from a New England/Canada cruise, from Dorval to JFK. My carry-on was searched twice -- once at the regular security gate and again just before I boarded the aircraft (an American Eagle Saab). My checked bag was also searched, rather thoroughly and cameras to be turned on. I pulled out my passport so often, I thought I would wear it out. They checked everything but the fillings in my teeth.
I disagree with one comment in the previous post, a negative feeling about not seeing security personnel. IMO, the best Security can be the Security you do not see.
I think the "no nail clippers" is overkill, but I have to respect their judgement on this, as there might be a very good reason.
btw: Security on the ship (Holland America Line's "Amsterdam") was just as tight. The attack occurred partway through the cruise, but we still had pre-boarding carry-on searches and metal-detector gates. After the attack, we were allowed back on the ship, during port calls, with the same level of security as if we were boarding an airplane.
No carry-on, as a safety measure? I mean no offense to the baggage-handlers, but do you really think my camera bag will be returned to me as full as when I checked it? Hellooooooooooo??
Condolences to all; I also suffered a loss on United 175.