ive travelled solo quite a lot with diabetes and it has always been fine. never been to US but I can imagine its not complicated to get medical help if needed. Just make sure you have medical insurance to cover any unexpected hospital visits etc. Take lots of extra supplies like insulin,testing strips,needles, ketosticks and frio bag if you go to hot climate. Have fun and try not to panic. 10 hours on a plane is like sitting on a sofa and watching tv. you may need some extra insulin.
when travelling I test regularly as its difficult to estimate carb content and hot weather may affect sugar levels too