Was there a BLT sandwich at McDonalds in the past?

McBLTYes, but it was actually called the McDLT sandwich. It had a special packaging that kept the beef of the burger warm, while keeping the lettuce, tomatoes, and other veggies cold on the other side. If you do a search for the McDLT, you will find a commercial for it filmed back in the 80's, starring Seinfeld's Jason Alexander.