Instead of hailing a taxi to the Phoenix airport you’ve decided to allow yourself a little more luxury, comfort and convenience by hiring an airport limo instead.

You open the Yellow Pages and see dozens of companies offering limousine services. So how do you choose which airport transportation service company is right for you? Do you pick the one with the best advertisement? The one with the catchy slogan? Or do you close your eyes, move your pointing finger up and down the page and pray that the company your finger lands on when you stop is, if not good, at least a decent one?

Here are four signs you could use to spot a bad limo company:

They Don’t Offer Customers with Much Options

One of the luxuries renting an airport limo should afford you is the comfort of choice. So when a the a company you are looking to hire tells you that the only vehicle they have available for your use is a pink super stretch limo or that their driver is not available to pick you up at 10 A.M., but can come at 11 in the morning instead, then you better start dialing the number of another company.

Lousy Customer Service

You’ve tried calling them to ask about their rates and services but your calls never seem to get through. If you are lucky enough to be able to talk to someone, they give you nothing but vague answers that lack both depth and politeness. These sound familiar? If they are, then take them as ominous signs that the limo company’s service will be, well, less than satisfactory.

Their Cars are Old

Unless you are purposely looking to rent a vintage limo or Towncar, then it would be wise to rent from a transportation company with newer and better-maintained vehicles. You don’t want to miss the flight home because the limo you rented suddenly broke down in the middle of the road, do you?

And while some may argue that well-maintained old cars are still able to run well, no one can say that an old car, no matter how finely tuned it is, can outperform a brand new one.

No Insurance Or License

One of the reasons why you take limousines instead of ordinary cabs is for the added security they provide—and you can’t get these when the limo company you are about to hire has no license from the Department or Tourism or insurance for their passengers.

You comfort, convenience and safety depends on the quality of the limo company you hire. Choose the wrong one and you might end up late for your flight home or in the middle of an empty road with an overheated limo. Choose the right one and you are in for one of the most convenient and comfortable rides of your life. Use the four signs to make the right choice.