Uh, oh. I hope that doesn't mean we're doomed for our next trip in June when DD will be 16 months.
It definitely depends on your kid, all of mine are boys (surprise surprise!) and sitting still was very hard for them. If you are well prepared with activities and treats you should be ok. You also need to be a little flexible with your plans, as long as you don't get bent out of shape when plans change.
Another tip for international trips (it took me until my 4th child to actually agree to this) is to use melatonin to help with jetlag for the kids and it really helped with the crankiness factor. I think it's not recommended for under 2 though.