That's correct.

Although there was a huge disparity in twin-aisle aircraft between the pre-merger companies, UA primarily used the jumbos for routes like ORD-DSM, SFO-RNO, and IAD-BOS. Sadly, we just didn't have any aircraft with big motors or iPhone-level long range navigation systems. Thankfully the meger happened so now we can operate nonstop back to IAD.

FWIW, here's the YouTube version of the video mentioned at the start of this thread.