I'm about to purchase my first plane tickets since I've started playing the miles/points game, and I'd like to avoid the missed-points regret we're all too familiar with. I'm buying plane tickets for a business trip for myself and several coworkers: round-trip domestic flight on Delta. I'll be reimbursed by my employer, so I'm putting everyone's flights on my credit card to maximize points. The only card I have with bonus points for flights is CSP, so I'm assuming I should use that -- but is there an advantage to booking through Amex since they're partners with Delta? I have MR with my Amex Green, so does booking through Amex Travel do anything for me? If so, can I book through Amex Travel but pay with CSP? Or should I book through the Chase travel? Also, anything else I'm missing in terms of ways to gain points when buying flights? EDIT: Ok, I'm starting to answer my own questions. Amex says you can earn 1 extra MR pt/dollar when using a MR-program-enrolled card and booking through Amex travel, which means 2pts/dollar if booked with Amex Green. Is this like Chase UR online shopping (can still get the points with non-Chase card, but they won't help you if the points go missing), or do you actually need to use the Amex card to get the MR points at all? Regardless, it seems like booking through Chase is the better option. I get an extra pt/dollar there too, and I'll use my CSP, so 3pts/dollar. As far as I can tell, I should book the Delta tickets through Chase and use my CSP, netting 3pts/dollar on the purchase. Please let me know if I'm missing a better option.