Scott
Its looks like DFW has had the benefit of being designed from scratch rather than growing up over time with bits and pieces added on as more capacity was needed. What's the hourly throughput? 150+? We top out at about 100/hour just now, but there is definately spare capacity there. Ground can be a mess though!
As niteflite01 will attest, it is very difficult to get more concrete at UK airports due to local objections and a lack of growing space. Since 1970 there have only been two full-length runways built in the UK. At Edinburgh in 1973(ish) and Manchester in 2001(correct?). Funnily enough both places I worked at before moving here.
BTW I think we hi-jacked the thread.
Sorry Newark Anagram