Originally Posted by
fedechat
One of the flight attendants (a nice one) that I have on my JFK-LAX leg a couple of weeks ago told me... I see you are coming from GIG, do you know we have a direct GRU-LAX right?, I told him "yes on a new 787, but I'm doing a MR" and he said "oh a MR, that's why!", the best part is I didn't tell him that I another LAX-MIA after that

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He knew that I came from GIG (772 retrofit) and he was suggesting me GIG-GRU-LAX as a shorter/better connection.
Even if it wasn't for MR, I would still choose JFK over LAX for immigration. LAX is absolutely awful for immigration and security. Every time I go there it seems like I commit some sort of crime. Would never pick LAX for immigration purpose. You might even end up getting to LAX earlier than the nonstop GRU-LAX plus LAX immigration.