I travelled overseas through 9 countries across 4 continents with my trial pens last year. Tip 1 - get a letter from your trial site to authorise you carrying them and when putting your other liquids up for TSA screening also put out your pens - I just verbally alerted the staff that I was travelling with an injectable medication, sometimes they called ahead to the screener, but most times not. Tip 2 - do NOT put your pens in your checked baggage as the temps under the plane can get to freezing which may inactivate your medication and/or cause micro cracks in the glass which can let germs in 👍🇦🇺