What month are you travelling? Difficult to know what temperatures you will experience without knowing this. Personally, I've travelled across the Atlantic (to Central and South America, not USA) with insulin several times and never had any problems. For physical protection against knocks and temperature, I prefer to use a stainless steel vacuum flask, empty during flights to comply with fluid restrictions (no fluid, just cartridges in their plastic bubble packs) and filled with cool water at other times. Some people like Frio packs, but I think they're too expensive, don't offer as much physical protection against crush, vibration etc and have to be kept wet, but not so wet that they swell.
I would take extra supplies of insulin, blood glucose test strips etc, but I would never allow any insulin to travel in the plane hold, as temperatures can be below freezing at flight altitude. Spare lancets are OK in hold, as temperature won't affect them.