TWA has a decent fare sale fromt the West Coast to LGW. The rules state you can't fly on flights 3000==>4000. All of the flights into STL with decent transfer times are in this range. All other flights (2000==>2999) arrive in the early to late morning---this translates into a 7 hour plus layover time.
The fare difference is over $200 if you do not want the long layover. This makes no sense when I can fly any other airline (including AA) for the lower price.
Why would anyone fly TWA with rules like this????
You have me very much confused here. I see the rule in the fare ($397?) SEA-LGW SLXTW70, but am having no problem booking this with easy, convenient connections. I can only assume you're trying to do this on AA.com where you're running into troubles because AA codeshares are assigned numbers in that range. So, basically, you're going to have to give up your online booking bonus to get this. Or just book through TWA.com and use your AAdvantage number on the flights. Here is what I was able to book at Travelocity.com
1 adult @ USD 475.70 (397.00 plus 78.70 taxes/fees/airport charges)
Flight: TWA Airlines 546 on a Boeing 757 Jet
Depart: Seattle/Tacoma, WA (SEA) - Thu, Nov 08 11:57am
Arrive: St Louis, MO (STL) - Thu, Nov 08 5:49pm
Flight: TWA Airlines 720 on a Boeing 767 Jet
Depart: St Louis, MO (STL) - Thu, Nov 08 7:20pm
Arrive: London Gatwick, UK (LGW) - Fri, Nov 09 9:40am
Flight: TWA Airlines 721 on a Boeing 767 Jet
Depart: London Gatwick, UK (LGW) - Mon, Nov 12 11:30am
Arrive: St Louis, MO (STL) - Mon, Nov 12 3:15pm
Flight: TWA Airlines 53 on a Boeing 757 Jet
Depart: St Louis, MO (STL) - Mon, Nov 12 5:24pm
Arrive: Seattle/Tacoma, WA (SEA) - Mon, Nov 12 7:58pm
I was trying to book this in Sabre---I will try TWA.com.