I am a Marriott Rewards Gold member, a Southwest Rapid Rewards member and a Hertz Gold Club member. I always use the Marriott discount and ask for Southwest Air credit when reserving a car. Since I have ALOT of Marriott points, I usually ask for Southwest Air credit at when staying at Marriott. Am I optimizing each entity's rewards program? Can I ask for credit with each rewards program i.e. get Marriott Rewards points as well as Southwest points from each Marriott stay as well as Marriott and Southwest points from each Hertz rental. Make sense? I want to make sure I am earning every point I can. Thanks in advance.