If you are flying on shorthaul work tickets, you will be raking in a lot more redeemable miles (and ones that dont expire in 2020) crediting to a revenue-based program like MileagePlus,
No fuel scamcharges or fake taxes when redeeming also a bonus.
Another bonus is you can even buy domestic AC J/Y tickets on united.com - and earn revenue based points. And J trips will earn 200% qualifying miles.