Meh...
I've been such a fan of CS for years and I've had little to say about most of your DLC's, but honestly, this disappoints me greatly. I would have much rather seen improvements on things like maybe adding medium size districts for residential and commercial. Large capacity schools for big cities and fixing things like your zoning so that you don't get towering sky-scrapers in low density tourism and a few of the other things that both modders and fans really felt the need to see.
Frankly, the airports we already have seem like plenty and you could have just spruced those up with zoning so they integrate better with industry, commercial etc. I know you can't please everyone, but it just seems like there's a lack of interest in what fans want and I've seen plenty of complaints about zoning and zones from all sides of CS. Love you guys, but seriously, why airports? This just might be the first DLC I will never buy, or I will wait until it's super cheap to get. And I've bought every one on the day of release, or soon thereafter, up until now.