Nothing to do with a grass strip, just where it is built. I suppose you could build a small airport with a grass strip on undeveloped land and call it a green field airport but that is not what "green field" airport typically means.
If you build an airport on previously developed land it could be called a brown field airport.
NoWorries From United States of America, joined Oct 2006, 539 posts, RR: 1
Reply 7, posted (7 years 10 months 2 days 22 hours ago) and read 32767 times:
Just as an aside, in a similar vein, greenfield is sometimes used to describe new technology projects that aren't constrained by what has come before it, or an operating mode that isn't constrained by compatibility with previous versions ( for example, in order to offer maximum performance, a WiFi network might operate in 802.11n "greenfield" mode where it doesn't attempt to detect or coexist with earlier versions of the network)