One opportunity to both save a ton of $$$'s as well as de-stress travel is to investigate and use public transportation to from big airports.  In Europe, with their myriad rail connections, this is old news.  Even in the auto-oriented United States, depending on one's itinerary, length of visit and where one plans to go & stay, avoiding the taxi (Uber/Lyft) and the rental car from the airport can be a good move.

Choosing the strategy obviously depends on the airport/city you visit.  Chicago has great rail connections to/from both its airports (faster than taxi's to/from downtown at some times of the day) and parking in the city is problematic and expensive.  New York has a good connection from EWR, but the transit options from LGD are more challenging.  Los Angeles and Houston are more spread out and generally do require automobiles to get most places.  Lots of other cities and regions may fall somewhere in between; it's worth exploring options based on the benefits and challenges of having a car at your destination.  For example, downtown hotels often have high prices to park a car and are often walking distance to great restaurants.

Besides the biggest cities, one can use Transit from/to airports at Cleveland, Baltimore/Washington, Philadelphia, Atlanta, San Francisco, Boston (a mess any way you go).  The list keeps growing as airports collect, and have to figure out how to spend, their Passenger Facility Charges and transit connections seem like a logical (expensive) use of this cash. 

So before your next trip, decide, "Does one really need an automobile at one's destination, or is it just a simple trip from and then back to the airport?"  And before hiring a cab, look into transit (rail or bus) that sometimes is faster and almost always much, much cheaper.

Begin by exploring Google Maps and look at "Routing" via the Transit option.  Various routes will show up that include walking, train service and buses.  Google Maps ties into published schedules based on time of day/week, but be aware that these schedules may not always be adhered to.  Google will also provide an estimate of what the Uber rate might be.   The point is that you may not need to walk/shuttle to rental car counter, familiarizie yourself with a new automobile, determine directions in a strange city, find and pay for parking, etc. on your next trip.  The $$avings are usually significant and a bonus is that your trip's carbon footprint will be significantly reduced!

Exploring and using transit from/to an airport on your next trip may save you time (sometimes), and it will almost always save you (or your company) money.  It may also make your trip more relaxing and less polluting.