First of all, congratulations on your NSV, what an awesome feeling!!
Second, for those of us who aren't at that point yet, I bought my own seatbelt extender from an online store called Living Large. It was around $50 and well worth every penny. It folds up into a small little pouch the size of a cell phone and I just keep it right in my purse. I pull it out if I need it, if I don't then great, but I still have it if needed. I don't have to draw any attention to myself by having to ask for an extender and no one other than my traveling conpanions have even noticed I have it. Just a thought for someone who travels alot. It's one less thing to worry about when flying.