Hi! I see you’re having trouble submitting the travelers list in the Allegiant Airlines app on your iPhone with iOS 18.6. Let’s see what’s going on and get that fixed for you.

First, can I ask:
- Are you getting a specific error message besides “unable to submit travelers list”?
- Have you tried any fixes so far, such as restarting the app or your phone?
- Are you connected to a stable internet connection (Wi-Fi or cellular)?

Assuming you haven’t tried much yet, here’s a step-by-step approach we can try:

1. Check your internet connection: Make sure you have a strong Wi-Fi or cellular data connection, as poor connectivity can cause submission errors.

2. Force close and reopen the app: On iOS 18.6, swipe up from the bottom and hold (or double tap Home if you have it), then swipe the Allegiant app off the top to close. Open it again and try submitting.

3. Logout and login again: Log out of your Allegiant account within the app, then log back in. This can refresh your session and clear temporary glitches.

4. Update the app: Visit the App Store and check if an update is available for Allegiant. Sometimes bugs are fixed in updates.

5. Delete and reinstall the app: If none of the above works, uninstall the app, restart your iPhone, and reinstall Allegiant fresh from the App Store.

6. Try submitting the list via the web: If the app still won’t submit the travelers list, try accessing your booking on https://www.allegiantair.com from Safari on your iPhone and see if submitting the list works there.

If after all that, you still see the error, the issue might be on Allegiant’s server side or related to your specific booking details. In that case, contacting Allegiant support directly at [email protected] or via their website might be necessary.

Would you like me to guide you through any of these steps now? Also, feel free to tell me what you’ve tried so far so we don’t repeat anything.