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I've honestly struggled to get this airline connections demo working, and I'm going to try and summarize some of the steps I had to take to get things working...

Missing local config for new cluster

I had to manually create a local config directory with the same name as my cluster when attempting to run the local client at Step 5 of this guide, as I would get an error expecting the config to be found under a directory with the same name as the cluster:

cd connection-monitor
mvn clean package exec:java -Dexec.mainClass=hazelcast.platform.labs.airline.AirlineConnectionListener -Dexec.args=white-handsome-terabyte

...

Caused by: java.lang.RuntimeException: Did not find expected configuration at /Users/benheymink/.hazelcast/configs/white-handsome-terabyte

Fine, I can manually create that local config directory, copying the same config that was created when I ran the config import step from the browser. Other users might not know to do this though.

Config seems to be missing api-base property

After getting the config.json file in the right place, Step 5 then fails with an error, as the config is missing api-base:

mvn -X clean package exec:java -Dexec.mainClass=hazelcast.platform.labs.airline.AirlineConnectionListener -Dexec.args=white-handsome-terabyte
...
Caused by: java.lang.NullPointerException: Cannot invoke "com.fasterxml.jackson.databind.JsonNode.asText()" because the return value of "com.fasterxml.jackson.databind.JsonNode.get(String)" is null

This is due to api-base being missing in the config that is created/downloaded to the users machine. It looks like the code is meant to handle this:

        if (apiBase == null)
            apiBase = "https://api.viridian.hazelcast.com";

But this default value fallback occurs after the code attempts to read it and parse is as a string value, which obviously blows up. Manually adding the api-base property to my config file allowed me to get around this, and to get the demo working, but there is NO WAY a normal user would know, or be prepared to, mess around looking through the code to try to troubleshoot what is going on!

Following the tutorial here, I'm instructed to:

Go to the dashboard for your cluster and open Management Center.

In Management Center, select Stream Processing > Jobs

I can't seem to find this anywhere!

Was running through the airline connections demo but got stuck at the section where you are instructed to run the script connections_job.sql from the repo:

I believe this should be:
clc -c <your-cloud-config> script run connections_job.sql (Note the addition of the run command)