Farming out business

I've recently purchased a Sedan primarily for airport runs and corporate pick ups. Through aggressive marketing and advertising I find myself having to occasionally and reluctantly turn business away. I know it's in my best survival interest not to do this but am leary about farming business out. What is the typical Protocol and what do I want to look for (good and bad)when using another companies help?

There is another thread with a detailed answer --

http://limos.infopop.net/3/OpenTopic?a=tpc&s=250299454&f=121296554&m=7052912301

check it out ... if you have other questions, post it here and we will respond.

THankS!!!

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Thanks, the advice is very helpful and appreciate your help.