mission chinese feasability
Will you be dining alone? And how are you getting to the airport?
At that time of day, driving to the airport will only take 15 or 20 mins, and taking BART will only take about 35....the restaurant opens at 11:30 for lunch, so I think that if you arrive when it opens, you'll be totally fine.
That said, I wasn't a huge fan of Mission Chinese when I went in the winter. See: http://chowhound.chow.com/topics/829296 I do think I should go back sometime soon to try a few other things, and give it a second chance, but the line is always so long. Perhaps early on a Tuesday is really the best time to go!