[Котяра]

В конвенции по AS3 про 80 символов говорится в явном виде:

Wrap code to 80-character lines. This has the following advantages:

* Developers with smaller screens don't have to scroll horizontally to read long lines.
* A comparison utility can display two versions of a file side-by-side.
* The font size can be increased for projection before a group without requiring scrolling.
* The source code can be printed without clipping or wrapping.

здесь обсуждалось..