Ok, I can only address the pay rate. It would be hard to address total compensation, but I will try to answer some of your questions.
Lets look at
NW. For the 757 which we both fly, Northwest is 17.9% lower, or Delta is 21.8% higher, depending on how you look at it.
For CAL, again the 757, CAL is 33.2% lower, or Delta is 49.7% higher, again how you look at it.
For Southwest on the 737,
SW is 22.5% lower or Delta is 29% higher.
All these numbers are from airlinepilotpay.com, and the ones that I have been able to verifiy have been correct.
Now as for total compensation, Lets look at various 737 operators. My neighbor, who is a
SW 737 captain, averages 85 hours a month, flying 15 days. He says that is about average.So that gets you about 15,200 a month. A Delta 737 will get 75 hours a month (which is our cap right now) for 17,300 a month. For comparison, the pilots have offered a 23% pay cut (so about 178 per hour), and an increase in the cap to roughly 80. So that would put a Delta 737 pilot at 14,200 a month. The company has asked for a 35% cut (about 150 per hour) and an 85 hour cap, so you get to roughly 12,750 a month. For another 737 comparison, UAL pays 147 an hour for the 737 and they are flying close to 90 hours a month now, so using 90 a month that gets you about 13,200 a month. For CAL, the 737 pay rate (for the 737-300, which I am using for all) is 158. The guarantee is 72 a month but I have been told the average pilot there flies about 82, for about 12,956 a month.
Jetblue top pay is 139 an hour, but no one is on the top pay yet. So use the 5 year rate of 121 an hour. At
JB everything over 70 hours pays time and a half. I have been told the average
JB pilot gets about 85 a month. That gets you a total per month of about 11,200.
Other than
JB, where time and a half is automatic for hours above 75, I don't know much about overtime. At Delta, you have to put in for overtime (what we call a greenslip) and if needed, it is awarded in senirioty order. Depending on the manning level in your catagory, if you are senior (top 20% in your catagory) you can get it. A greenslip pays double pay.
Anyhow, there you have it.