Honestly I often know changes from Flighty for my flights before the airlines do or at least before they notify me. I had once my carrier said on time and Flighty said 90 mins delay. I went to the airport on time and turns out flight was delayed. Should have just trusted them!
But if, say, you are traveling with a pet that has to be verified at the counter, or you need to check a bag, the time windows for accepting those are set by the scheduled departure time. If your plane is still in the air or hasn't even left its origination airport (and, for the sake of argument here, we will assume you are flying from a smaller airport that doesn't have other aircraft that can easily be reassigned to your flight, so you know it will be delayed), it doesn't matter: they still close the check-in and baggage 45 minutes (on American; YMMV by airline) before scheduled departure. So you have no choice but to get there early and wait unless your airline actually declares the flight delayed when they know it will happen.
Not that many people on Android are willing to pay $60 for an app.
https://dontkillmyapp.com/ is just one example of the kind of problems app developers face on Android
Those platforms don't generate revenue
Like GP, I'm also a paid subscriber and I couldn't care less where else it's available. If anything, it being a native app rather than a multiplatform JS wrapper is a plus to me.
BTW, them being iOS-only means they're probably getting lots of marketing support from Apple and other perks. That can really help a startup.
The gp asked a reasonable question. Your admonition about making money is misplaced because your assumption about it being a hobby is incorrect.
The website was developed by Flighty LLC. To answer the gp's question: Although the website itself doesn't have direct monetization, it acts as "inbound marketing" for the paid iOS app. Clicking on "Download Flighty" takes the user to the Apple App Store:
In-App Purchases
Week-to-Week Flighty Pro $4.99
Annual Savings Flighty Pro $59.99
Month-to-Month Flighty Pro $9.99
Annual Savings (Family Plan) $119.00
Lifetime Flighty Pro $299.00
Flexible Monthly (Family Plan) $15.99
Week-to-Week Flighty Pro $4.99
Week-to-Week Flighty Pro $7.99
Pro Family Lifetime $449.00
Annual Savings Flighty Pro $59.99
It's not just a $5/month VPS. Some cursory googling says Flighty gets data from the FlightAware Firehose api which costs a lot of money. The cost would exceed the financial resources of most people to make an equivalent free hobby website. (https://www.flightaware.com/commercial/firehose/documentatio...)
How much does this app cost? Who knows?! Does a "Week-to-Week Flighty Pro" subscription cost $4.99 or $7.99? Why is Week-to-Week Flighty Pro $4.99 in the list twice? Same for Annual Savings Flighty Pro $59.99. Apple have made such a fucking mess of in-app purchases that we end up with this kind of rubbish, and I can't place any trust in a developer who allows their in-app purchases list to look like this. So they just lost a sale.
It’s not just about money. It’s complexity, company size, management, etc.. Loss of focus by having to build a new app from ground up. Features and improvements take longer as they have to be done twice. Parity problems. Support debt. Maintaining multiple versions of the same app isn’t just “hire more”.
As you agreed with, they are successful. Maybe they’re happy with that.
They probably haven't done it because it doesn't make sense for them financially.
The main reason I also am not president of the world already is because I wouldn't like the attention.