Guarantee is the minimum you will make. Hourly pay x guaranteed hours = minimum monthly pay. Fly or get credited more than guarantee and you make more.
Per Diem from the time you check in until you check out. Say you check in at 1200 on Monday and check out at 1200 on Wednesday. You get 48 hours of per diem.
Duty rigs are meant to make the airline schedule more efficiently. Say a duty rig is 3:1. For every 3 hours from check in to check out you you get credited for 1 hour of flight pay. At the end of the trip, you get paid the greater of the pay for the hours flow or the duty rig. For example: Check in Monday at 1200, fly 2.5 hours, lay over until Wednesday, fly 2.5 hours home, check out at 1200. There were 5 hours of flight pay. 48 hours on duty = 16 hours credit. So instead of being paid 5 hours for the trip, you get paid 16 hours. Now same duty period of 48 hours but you fly 3 8 hour legs in the time. Flight pay = 24 hours and duty rig = 16 hour. You get paid 24 hours.
At Hawaiian, we also have a trip rig in addition to the duty rig. After a certain length of lay over, we start getting additional pay for our ground time. I think it is 3.5:1. This is because we have some places with 24+ hour layovers (Australia and soon PI). One of these trips typically lasts 4 days with about 20 hours flying. We typically get about 30 hours pay for the trip.
International override is an added $ amount to your hourly rate if you are flying an international trip. If your pay was $65/hr with a $5/hr override, you would get paid the $65/hr for domestic flying but $70/hr for international.
Fly on a day off and get double the hourly rate (at Hawaiian).
A good idea of then pay scales can be found at
http://www.airlinepilotcentral.com/. Click on the Airline profiles at the top right of the page.
I'm fat and ugly and the hired me......