robyng,
Your link did not work for me.
I am certainly prepared to search/compare. As to "booking them as 2 separate trips", I doubt I would do that, mainly because of checked luggage concerns.
We usually fly Delta out of Knoxville but the past 2 autumns, we flew internationally AA and CO as their schedules and prices were considerably better than Delta. I tried for weeks to find a good Delta flight to Great Britain, but finally had to give it up.