I am hoping it will be a positive change just in terms of reaching secondary US cities given how much bigger UA is than B6. Currently based on PIT so the only option on a single EK-issued ticket is PIT-BOS-DXB with long layovers in Boston both ways and so we have been driving to IAD if we want to fly EK or using QR/EY that allow AA on the domestic segment. Allowing domestic flights on UA would open up PIT-IAD/EWR/ORD/IAH/SFO-DXB as options.