Hi there! I see you're having trouble with the Alaska Airlines app not working on your iPhone. Could you tell me a bit more about what's happening? For example, does the app not open at all, crash after opening, or is a specific feature not working? Any details will help me guide you better.

While I wait for your details, here are some common initial steps we can try on your iOS 18.6.2 iPhone:

1. Restart Your iPhone
Sometimes a quick restart can clear temporary glitches.

2. Update the App
Open the App Store, go to your profile, and check if there's an update available for the Alaska Airlines app. Running the latest version helps avoid bugs.

3. Force Close and Reopen the App
Swipe up from the bottom and pause (or double-click the Home button if your iPhone has one), then swipe up on the Alaska Airlines app to close it fully. Try reopening.

4. Check Location Services
Go to Settings > Privacy > Location Services, find Alaska Airlines, and make sure it's set to "While Using the App" or "Always." Sometimes the app relies on location and can misbehave if disabled.

5. Reinstall the App
Delete the app from your home screen, then reinstall it from the App Store. This removes any corrupted files.

If you've already tried any of these, please let me know which ones, and if you see any error messages or specific issues. That way we can dive deeper or explore other fixes for you.

Are you able to try these steps and tell me what happens?