We're in the process of finalizing arrangements with our regional airline partners to operate the flights. We'll have our first flights within the next few months.
Huh? We're signing up to be notified, we're not handing over cash. They'd be useful if they worked out, so I threw a disposable e-mail address in the hat.
If I get an e-mail in a couple of months that this works, awesome, I'll give them a spin. If not, oh well. But why would their customers be angry? It's pretty clear it's not an existing service yet.
I find it a bit misleading that you don't state this more clearly upfront.
> We'll have our first flights within the next few months.
... if everything goes as expected, if not then you'll be liable with a whole bunch of angry first customers.