Thanks, everyone! I think my three main worries were that it only has two engines (but you let me know that newer planes, including ones I've flown on, also only have two engines), that it's small for crossing the Atlantic (but you told me that even smaller planes go across), and that it's "old" (but you said that it's not TOO old). The most important thing is that you assured me that you've flown on 767's and survived! I feel much better about my trip now and really appreciate all your comments.