Originally Posted by rch4u

Please do let us know. I sent a familiar follow-up to 1KVoice and spelled out exactly why a refund was warranted in my circumstance (change of operating carrier and class of service), including links to and references from the COC.

Relevant Contract of Carriage Rule 24 excerpts:

https://www.united.com/ual/en/us/fly...-carriage.html

Rule 24 Flight Delays/Cancellations/Aircraft Changes
B.Definitions - For the purpose of this Rule, the following terms have the meanings below:
1.Schedule Change – an advance change in UA’s schedule (including a change in operating carrier or itinerary) that is not a unique event such as Irregular Operations or Force Majeure Event as defined below.
....
7. Irregular Operations – any of the following irregularities:
....
c. Substitution of aircraft type that provides different classes of service or different seat configurations;