I know there are a lot of pilots who bad-mouth the Air, Inc. seminars. Lots of pilots spend the money and don't get hired.
However, my husband was hired on by Alaska Airlines and, while he had his resume walked in to the Chief Pilot by a buddy and he updated it regularly and had letters of recommendation from Alaska pilots on file, he feels that the deciding factor in his getting hired was the face-to-face meeting he had with the LA Regional Chief Pilot of Alaska Airlines at the Air, Inc. seminar in Los Angeles. He attended the seminar and got some good resume pointers as well. The face-to-face contact with one of the recruiters (who ended up being on the interview panel) turned out to be invaluable - she remembered him and he immediately felt like he had an advocate in an otherwise intimidating panel interview. Now, my husband got to spend a good 20-30 minutes talking to the Barry Rainey which is phenominal. He told me that very few of the pilots in line with him got to spend more than 2-3 minutes shaking hands and introducing themselves as they slipped him their resume materials. But there's always a chance... It was not long after that seminar experience that he got a call from his buddy telling him to get his application updated ASAP because they were getting ready to complete the call list and his name was going to be on it if his info was current. We didn't have a lot of money at the time so it was definitely a tough decision for us to make but we never have regretted it. It was worth every penny.
Good luck in your endeavor!