I know it's past the time when your family is flying, but could be helpful for other readers... My wife and I flew SW to Cancun for our honeymoon about a year and a half ago. I tweeted the SW twitter account about us using them to make the trek and if there were "any fun perks for us on this special trip", they were very kind and told us to talk to the agent at the gate as they put some notes in our reservation. The gate agent then gave us free wifi codes, and priority boarding. SW also mailed us some TShirts and drink vouchers a month later. While on the plane, they made an announcement and brought us AN ENTIRE BOTTLE of champagne. The key is to be kind, polite, and excited. Never demanding. It doesn't hurt to ask, but do it in a way that doesn't leave the person you're talking to in a bind if they're not allowed or unable to do anything. It really started our trip off on a high note, and I tell anyone who is flying SW for such an occasion to give it a try too.
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