I got some from Amazon and they were really good. https://amzn.eu/d/7bboxQw Definitely use pull ups for your long journey
My son has had dry nappy pants for the last 6 days I said to my self in another 6 days if they are dry I will do pants at night. If we was flying somewhere I’d defiently put nappy pants on him to save you and him the worry. As you don’t know when you can get up. But it is in may your holiday so I would assess the situation nearer the time x
We use pull up pants for sleep. My son isn’t potty trained over night has a wet pull up in the morning. We’re also going to Dubai end of April / early may and will be packing pull ups