Will the ride exceed a couple miles? Anytime you're riding more than 15 to 20 miles, an airport shuttle service will want your business, as this is generally where it is worthwhile for a shuttle to want your business and this is generally where there minimum miles starts at.
When businesses fly a group or groups of employees to meetings or conferences, a shuttle service represents a sensible way to transport the group as it keeps the rate lower and keeps the group from being scattered in separate vehicles.
Although the choice to go with a shuttle is sometimes a budget decision, shuttles are frequently chosen over cabs because of luxury or space issues. Alot of people that hire limos, often change to airport
shuttles for the reason all they really want is a step up over a taxi when it comes to comfort. Shuttles are also a little more practical if you happen to be traveling with lots of personal effects.
If there happen to be any disadvantages to utilizing a shuttle as compared to a taxi, it would be an issue of convenience. Many might consider it a problem to go through the trouble to reserve a shuttle when they can simply exit the airport and catch a taxi within a few minutes or so. And this makes sense if you only riding a few blocks. Luxury and spaciousness are not issues for a 5 minute ride.
A lot of us that travel often will one day take a ride with a shuttle service for the simple reason that they know that a shuttle service will always take their credit card. With business travelers getting company reimbursed for travel costs, it is pretty common that they pay with a company credit card.