Hub to cover Eastern Europe and ex-USSR?
How about WAW?
According to statistics, fastest growing aviation market in Europe. Could also provide good loads due to sizeable population of polish origin in USA and Canada.
IIRC, trafiic at WAW is already too big for terminal built just over daecade ago and new one is being added.
It used to be served by PanAm and Delta, but I don't think any other line is serving transatlantic directly from there (except LO, of course).