I'm just curious what percentage others tip at an airport bar. No food, just drinks. My wife thinks I overtip and should only be giving a buck a drink, just like we do in downtown Vegas, even if the drinks are waaay overpriced. So, if we each have two drinks a piece and the bill is $54, she says $4. That just doesn't seem like enough, especially if they are friendly and chat a little. Now, we just had the most unfriendly, inattentive bartender in the Seattle airport and on a $40 bill, I did just leave $4 and thinking back, i should have stiffed her, but I have a hard time doing that. I'm a generous tipper especially if we are dining and the service is good. Back home, if we just stop for a couple of drinks at a local bar, then I'll easily leave a 20% tip. Or at MSS, I'm a bigger tipper then $1 a drink. But at an airport bar, what do you think?