Actually, we've had chat ever since this site started, but we're curious how many people are unaware it exists because it's not prominently linked to.
Our main chat room is called The Hangar. It requires 20 reputation to talk in chat, but unlike the Q&A site where discussion is discouraged, random conversations (especially those related to aviation) are perfectly on-topic.
Have questions about how chat works? Check out its FAQ first. If that doesn't help, then you can ask in chat itself, or here on meta.
This post actually came out of a discussion in chat about how there may be members who are unware chat exists, or unsure how to get there. See the transcript starting here.
As always, if you have ideas for getting more members of the community involved in chat, the blog, or Stack Exchange in general, feel free to propose them. We're doing great as a site and community, but we're always happy to get more people involved.