Basically it's a script that scrapes several places for flight deals and "mistake fares" and notifies my phone if my city happened to be on the journey.

The phone notification was crucial b/c such deals sold really fast. In case the booking didn't work out I was usually covered by the 24 hour cancellation rule [0].

I started off running it on my own server but later I learned IFTTT handles device notifications without paying the Apple Developer tax, so I migrated things there. Used it more when I was single but nevertheless it's helped me land some killer deals to help meet certain traveling goals, e.g. NYC-Dublin RT for $300, NYC-Paris RT for ~$400.

Thought about making a paid app out of it but the limited seating and time-sensitive nature of the deals is likely a deal breaker.

[0] https://www.transportation.gov/airconsumer/notice-24hour-res... [1] I believe this rule, which is not so broadly known, was imposed on air carriers in response to certain fraudulent online marketing practices going on at the time.