It wasn't in my case - at least at one airline. A buddy of mine took me to see his chief pilot at United, we spent an hour or so talking. He said he would put me on the top of his list, ya-da, ya-da. Meanwhile I only had a handful of internal recs (no chief pilot meetings) at Delta and got the call first from them. The day I was walking through the ATL airport to go to my interview, United called. I called the chief pilot at United that I had met with and he was obviously saddened (not because they missed out on this subpar pilot - but because it took so long to get people on "his list" to the call-list). I honestly haven't seen a correlation between knowing someone (other than if one of your parents was a pilot there) and getting the call. Many/most of the recs I've written have gotten a call, but some absolute rockstars never even got the invite to interview. Sometimes it seems no rhyme or reason.