As an airline pilot, seniority is everything. Not so much in any other aspect of the airline industry. As a pilot, wages, schedules, vacations, elections etc are all based on your seniority. Unlike other occupations if you switch companies you can still be hired into a top level position. Example, a bank manager can be hired right into a bank manager position at another bank and doesn't need to start over as a teller or apprentice.
In my line of work switching companies loses all date of hire rights from any previous employer. This has bitten me time and again even though I have flown under the Delta colors most of my aviation career. I had 10 years with Delta and left as a B737-200 systems instructor, left for 3 months and flew with American Eagle before transferring back to Delta owned Atlantic Southeast Airlines and flew for them as a Delta Connection Carrier for 7 years. Each time starting again at the bottom seniority of 1000's of pilots. Being hired as a line pilot for Delta in Aug. '07 I again started at the bottom of the pile of about 7000 pilots.
Now with the merger of the Northwest pilot group and the Delta pilot group I received my new seniority number. Out of 12,434 I am number 11547. I have 796 pilots below me. I was hoping for 1000 below me. Before the integration list was handed down by the arbitrators 93% of the Delta pilot group was above me. Now the merged list has 92% above me so percentage wise I gained actually just over 1/2 a percent.
Looks like a peons life for me for quite some time. Ah well, maybe things will improve as I still have 17 years to build seniority.