Join Date: Nov 1999
Location: St. Louis, MO - AA PLT/2.98MM (Lifetime PLT), Delta PM, SPG Gold, AMEX Plat
Programs: TW Elite (RIP), CO OnePass
Posts: 1,923
I don't believe you can do curbside baggage check-in for International flights, although I'm not 100% certain.
At Lambert, there is a separate check-in area for international flights. Considering that TWA's international service out of Lambert is now the flight to LGW plus whatever service they have left to Canada and Mexico, the lines shouldn't be too bad for your trip.
Greg