If you need to get someplace on time, such as to the airport, train or bus station, you can't depend on Yellow Cab to pick you up. Take the bus, reserve another car service, or have a friend give you a ride.
I called at 6am for a ride to the train station downtown from Wilkinsburg for a train that was leaving at 7:30am. I gave my pickup address which is on Hampton Ave and was told it is not in their system. He sounded highly doubtful that i was correct about the street THAT I LIVE ON, so I asked if that meant I wouldn't be picked up, and the agent said "maybe"!!! I asked what I should do and he said I could try calling back in 15 or 20 minutes. Sounds like I'd have better odds playing the lottery.
Maybe I'm naive, but I can't believe that's an acceptable customer experience.
So I hoofed it to the busway with my bags, which for me is a mile, buy at that point I felt lucky to have an option.