Just an addendum to make it quite clear that certification of the airport and the role of SHG and others in the context the whole DBO affair has nothing to do with any airline or any other carrier. Indeed SHG will give you pretty short shrift if you as an intending consumer conflate the separate issues.
This is an enterprise economy and not an example of philanthropy in action, you as a an intending consumer share the risks so be aware of what that involves. I want to see the charterer's name not some ticketing agency whatever that means and I want to see the full ATOL details in the public domain. And much else besides but that will do for starters.