Originally Posted by
QueenOfCoach
Good question. By experience, living and working in the US, I know where tipping is customary and where it is not. If you are not a US resident and truly do not know where tipping is customary, you are well advised to ask someone when you first come to the US for a visit.
Also, for those FTers visiting the US for the first time (Canada too I would think) might want to read the sticky thread
SkiAdcock wrote 3 years ago about tipping guidelines that is located on top of Travelbuzz's threads.