Joel found a good article about David. You can read it at http://vivatropical.com/panama/david/
It looks like the article is about three years old, judging by the comments. The airport expansion is now finished but there are still no direct flights to the USA. If there were it would be convenient for those of us who travel to the USA, but it would also bring in more people and probably raise prices which might not be a good thing. The article was right that David is a booming area, and is probably is even more so now. There is a new bus terminal under construction, and a mall that is supposed to rival Albrook in Panama City. There are houses and commercial buildings under construction everywhere you look.
I believe tourism is encouraged even more now under President Varela’s administration. Tocumen airport in Panama City has a large new wing and yet another is under construction. There are more flights to more destinations every year. There are also more flights from Panama City to David from Albrook, and also from Tocumen now that Copa is offering that service. The article is right in saying David is not a tourist destination. It is a busy, working city in an agricultural area but there are so many wonderful places in Chiriqui that it’s a great home base.
Under fast facts at the bottom, the temperatures only reach upper 90’s at the height of summer, around March. Most of the time the highs are in the mid-80’s which though too warm for some, aren’t bad as long as you stay out of the hot afternoon sun. At this moment it is 4PM and the temperature on my terrace is a balmy 82 with a light breeze. If you prefer something cooler you can go up the mountain until you find the elevation and climate that is just right for you.
Anyway, good article. Check it out if you want to learn more about David.