It looks like GA is being lumped in the same category with DC-9 aircraft since I don’t see any distinction.
On Page 16
“Part-B Mobile Sources
“Sec. 821. Greenhouse Gas Emission Standards for Mobile Sources.
Pursuant to section 231(a), the Administrator shall promulgate standards applicable to emissions of greenhouse gases from new aircraft and new
engines used in aircraft by December 31, 2012. Not withstanding any requirement in section 231(a), the Administrator, in consultation with the Administrator of the Federal Aviation Administration, shall also promulgate standards applicable to emissions of greenhouse gases from other classes and categories of aircraft and aircraft engines for such classes and
categories as the Administrator determines appropriate and in the timeframe the Administrator determines appropriate. The Administrator may revise
these standards from time to time.
‘‘(2) Standards under section 231(a) applicable to emissions of greenhouse gases from new aircraft and new engines used in aircraft, and any later revisions or additional standards, shall achieve the greatest degree of emission reduction achievable based on the application of technology which the Administrator determines will be available at the time such standards take effect, taking into consideration cost, energy, and safety factors associated with the application of such technology. Any such standards
shall take effect after such period as the Administrator finds necessary to permit the development and application of the requisite technology.