Originally Posted by
Flyhayes
FAR 117.23 superseded the 121 cumulative regulations.
The Letter of Interpretation Tired Soul brings up is null and void.
However your airline may impose additional limitations.
Correct.
Only outside 121/91k flying counts against your rest/duty/flight time limitations under 117.
Some airlines still have policy limits on ANY outside flying, but you could address that with the airline, it's not regulatory.