Hi there! I understand your flight is not showing up in the Kiwi.com app on your Mac running OS X 10.15.7. Let's get this sorted out together.

To start, could you please tell me:

1. Did you book your flight through the Kiwi.com app or the website?
2. Have you received a confirmation email with your booking details and flight number?
3. Are you logged into the Kiwi app with the same account you used to make the booking?

Meanwhile, here are some simple checks you can try:

1. Verify Login: Make sure you are logged into the correct Kiwi.com account in the app. Sometimes flights don’t show if logged into a different profile.
2. Refresh the App: Try closing and reopening the app to refresh the trip data.
3. Check Email Confirmation: Confirm that you have received an email from Kiwi.com containing your booking information. This usually includes a booking reference or PNR number.
4. Check "My Trips" Section: Flights should appear under the "My Trips" tab in the app.

If after checking these you still can't see the flight, you might want to try logging in on the Kiwi.com website on your Mac’s browser to confirm if the flight details appear there. Sometimes there can be a sync delay or a temporary issue on the app.

Also, occasionally Kiwi.com flights might not show up in the app if the booking confirmation process is incomplete or if there's an issue syncing with the airline’s system. If the flight shows on the website but not the app, a reinstall of the app could help.

Let me know what you find with these steps, and if we need, we can dive deeper to resolve this!

Are you satisfied with the initial suggestions, or do you want me to guide you through more advanced troubleshooting?