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Welcome to FT!
Are you looking for a credit card, or a frequent-flyer program? Neither Travelocity nor Delta Reserve is a frequent-flyer program.
If you plan to take only nonstop flights between JFK and LAX, look into the frequent-flyer programs of the several airlines that fly that route.
What is your primary goal in joining a frequent-flyer program? Redeeming for free flights (if so, to where and in what class of service)? Upgrades on your paid tickets? Free checked baggage? Lounge access? Depending on what is most important to you, the recommendation as to which program to join will vary. Also, will you be buying the cheapest Coach tickets, Business Class tickets, or First Class tickets on your paid flights?