Welcome @anonmike, While we wait for members to share their experience with self catherizing while traveling I thought I would share this article on the topic that may be helpful.

--- Flying with Intermittent Catheters: Relax After - Reading These Must-know Tips:
https://www.compactcath.com/blog/flying-with-catheters-plane-tsa/.
Have you talked to your care team or doctor to see if they might have some suggestions or tips?