There is another key consideration with your comfort on the plane. Namely, using the toilet. If you’re catheterised, this is less of an issue, but if you aren’t then it’s an issue that requires some careful thought. Airplane bathrooms are incredibly small and there is no way during the flight that you can be carried to one to make use of the facilities.
The length of the flight will affect how big of an issue this is for you. Managing toileting on a short flight is easier than on a long haul one. You may be able to use a urinal on the flight – this is much easier for men than women – and have the person you’re travelling with empty it for you afterwards, but there are privacy issues with this.
Another option is to look into continence care products, such as pants or pads, to help you during the journey. It’s advisable, if you go this route, to get products with the highest absorbency and carry spares with you so that you can use the facilities at your destination airport to change once you land, should you need to.