To refine the above info.....

As far as bases a Seniority.....

Looking at the last bid that involved the 'recalls' of the CAL furloughs (being the most junior obviously), and judging by where they were awarded as being the "junior" awards, they were placed in (system bid within the last month):
B737-IAH
B756-EWR
B737-EWR
B737-GUM
The majority of the numbers went to IAH/EWR on the B737. Then the next bulk went to B756 EWR, followed by approx 15 to B737 GUM. The MOST Senior base at CAL as things presently stand (both seats accounted for) would be the B777 IAH.

If you wanted to fly Int'l, by far your best bet is B756 EWR. You'll get some Int'l on the B737(to Central/South Americas/Caribbean/Canada/ect...).

Again, that's as things PRESENTLY stand. Keep that in mind, post merger, who knows.....Hope that info helps.