Thanks for your help. Our flight comes in from St. George, UT to Terminal 8 and we get bussed to Terminal 7. Since we always traveled on AA, we had to leave and walk outside to Terminal 4. This time we changed to CO to avoid LHR and I read a tunnel was open but darned if I can find any reference to it on over 100 Google searches. Also searched all the forums on Flyer Talk. So I really do appreciate your time in sharing.