I'm not sure if this is applicable in the other countries, but I suspect it is...
On today's news up here in Canada, there were reports that airlines are going to start cracking down on overweight/oversize carry-on luggage. No doubt this has been necessitated by the increase in carry on bags as people try to avoid checked-baggage fees.
I use a Pelican case which is the max size for carry-on, but it weights about 44# loaded... more than double the allowable 20# limit! I've become adept at making this puppy look light as I expect many of you have as well. But, I live in fear at being stopped at the gate and being "forced" to check my case. This almost happened last year on a US Air flight (which was filled with young families heading to Disney I think... every three-year old had a back-pack the size of a Jetta). I advised the airline person that the case held about $12,000 worth of gear and I really didn't want to check it. Thankfully, she didn't weigh it. My initial thought is to add a second smaller case that my wife/photo-sherpa can take. (She normally only has a small backpack with my laptop and miscellaneous stuff...
Does anyone know what the usual "penalty" is for overweight carry-on luggage? Is it a fee, or do they force you to check the bag? I'm heading to Belize in a couple of weeks and the trip involves a commuter flight on some little puddle-hopper. I could care less if my clothes or dive gear go astray, but I would cry like a boiled baby if my cameras went astray...