Yeah, that's not going to cut it. All that does is demonstrate that certain fares are available on certain days. While domestic fare and revenue data is publicly-available, with the limiting factor being the ability to actually process it on a granular level, international is proprietary and generally cannot be shared publicly as the subscription services that maintain the data cost a fortune and have strict disclosure restrictions.

With that said, I'm not really sure what your point is? Are you suggesting that EWR-LHR is a laggard, and compared to what? And again, is this based on your conclusions from looking at advance-purchase fares and seat maps? Not particularly meaningful datapoints.