You might get the LAX SF3 immediately if you request it. I am not sure if they are still sending newhires to LAX or not, they stopped for a while but who knows. I would recommend going to an interview and asking. If not then you might be able to get DFW SF3 and transfer within 3-4 months. If you got the ERJ it might be longer to transfer into LAX, closer to a year I would estimate. Reserve at LAX would be long on the ERJ (1-2yrs) and shorter on the SF3 (maybe 6 months or less). I wouldnt expect much flying at LAX on reserve unless they send you to DFW to cover flying. Maybe 40hrs a month. These are guesses on the reserve times in LAX, but maybe someone else can pipe in with more accurate times.