http://www.etihadguest.com/en/earn-m...ihad-regional/

Flights eligible for Accrual
• All International flights operated and marketed by Etihad Regional.
• All flights operated by Etihad Regional and marketed by Etihad Airways.

I guess as it's a domestic flight, it would need to have Etihad (not Regional) as the marketing carrier (codeshare? ) to count.

On the other hand, as there is no passport check on domestic (or even intra-schengen) flights, in theory another person could fly those segments for you (Warning: wouldn't be legal!)