Can't buy strategic airports

I tried contracting the output of a strategic airport to one of my corporations, and was told I could not because I'm a free member. However, I got a three month subscription earlier today. Do I not understand the error message?

I was able to get it to work this morning, I guess it just took a while to work its way through the system.

It can take a few hours for all the back-end systems to flag you as a premium member. We're looking into fixing this.