Just a slight hijack, if Icelandair flies to your airport you can get to Glasgow, Manchester, London and other UK airports via Reykjavik for really cheap prices. I know the Baltimore to Heathrow route is consistently the cheapest flight available. The Aer Lingus flights I've looked at for the same route (except connecting in Dublin/Shannon, of course) are usually quite a bit more expensive. The only downside is Icelandair only flies to about 6 or 7 US cities.
Matt