As it turns out, not all of the special equipment listed became part of the RPO Trans AM package. Some ended up as separate RPO's and others as service options. The spoiler equipment was listed as a separate option (RPO D80) and referred to in the handout as auxiliary "aerodynamic" body panels.
For 1969, it appeared in the Firebird brochure as optional equipment available on all Firebird models and, later in the year became a part of the Trans Am package.

SPOILER ODDITIES...

Some very early 1969 Firebirds ordered with RPO D80 Air Spoiler equipment came through with the narrower 1968 style spoiler as can be seen on the back of the 1969 Firebird dealer brochure. Therefore, if your 1969 Firebird was made very early in the model year and has a narrow spoiler, chances are that it is correct and was installed at the factory.

The strangeness of seeing the narrow spoiler on the rear deck of a 1969 car puzzled many restorers and experts, leading them to think that someone had later "added" the wrong piece and in turn would "correct" the mistake by substituting the wider piece. Unfortunately, these corrections have lead to even more confusion since it would then appear as if fewer early cars were produced with the narrow spoilers then actually were!