Thanks for posting those charts! Very cool.
My only memory of the old Pittsburgh airport was in 1983 when I was 18 years old. A buddy of mine and myself decided last minute to take a PEOPLExpress flight to Ft. Lauderdale, Florida, for spring break in February. However, all flights were full and standby was our only option.
We arrived at Syracuse airport and were told that there were plenty of seats available... on the SYR to PIT flight. The PIT to FLL, however, was full, full full, and our only hope was to get our name on the standby list when we arrived in PIT. Risking a night in PIT, we decided to chance it.
When we arrived in PIT, we ran to the connecting gate down the end of one of those PIT "cul-de-sacs" and, to our dismay, spotted a large line at the desk. So, we stood in it and ended up getting 12th and 13th on the standby list. With a full airplane, we had no hope, until...
The person right behind us was checking in when suddenly, the PEOPLExpress reservation system crashed. The gate agent, getting all flustered, decided that the list she had started for standby became the list to board the airplane. We were now 12th and 13th to board the 100+ seat aircraft.
Climbing out of PIT in a PEOPLExpress B737 (IIRC), the captain announced "we are leaving Pittsburgh where the temperature is 20 degrees. Ft. Lauderdale is reported a temperature of 85 and sunny." The entire cabin broke out in a loud applause.
Sorry for the boring story but your taxi diagram of the old terminal brought back that memory...