Originally Posted by AAND
The only thing I would say is that, if you sign up for GLD and PLT simultaneously, your ~5000 miles on the way home will put you halfway toward your first set of 4 upgrade stickers. Plus, 1250 GLD bonus miles are 1250 GLD bonus miles. You also get a small bonus for finishing each challenge.
Actually I guess I was slightly wrong - if your GLD status posts after the first leg, you will get the GLD bonus for the first leg and the PLT for the second. By signing up for both, you would have your first set of 4 stickers upon returning to the US.