One dollar a bag should be sufficient for most
basic curbside handling that does not involve any
special services. If any special handling or service is involved, more is always appreciated and sometimes necessary. Should you arrive curbside near departure time and your bags require
any sort of special or expedited handling to make your flight, alert the SkyCap of your flight, ask him/her if they can personally assure you that your lugguage will make your flight, and if they can, perhaps an
extra five or ten dollars may just make the difference!
For direct, (as in non-stop) wheelchair assistance, point-to-point between curbside and the gate (either direction), five to ten dollars is usually appropriate in an airport that does not require more than five or ten minutes of their time. Should you require additional time, services or assistance, additional gratuity is certainly appropriate.
SkyCaps would much rather remain curbside and "turn" luggage than the requirement of being called away to handle "specials"
And, of course, it goes without saying,
never, ever stiff (as in not tip) a SkyCap,

waiter/waitress or chauffeur, etc! Even if it means writing a personal check.
From the LAX area,
MRLIMO
[This message has been edited by MRLIMO (edited 07-10-1999).]