I left Los Angeles airport Saturday night, the 15th and could not begin to register at the American Airline desk without a previously filled out entry form which I had in the cell phone. It seemed more important than my ticket and needed to be presented with my US passport. On the flight from Miami to Puerto Plata, I was presented with 5 different forms, one specifically for residents. The flight crew did not seem aware of the QR forms though I showed them from my cell phone. At immigration, in the DR citizen and resident line, there was no mention or request for this document on the phone. However at the final point of airport departure, close to walking out the door, there was a woman, not a security police person but more of an airline employee person who requested this form after checking through customs and not having even asked me for the customs declaration which I was holding. Again, at that moment after all night and sitting in the Miami airport and flying from there to the DR, I was glad I had it. I imagine it is not a universal requirement as I noticed not everyone was being asked and I would imagine that most passengers did not have it. ( None of the 5 or so forms I had filled out were requested at POP.)
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Considering the above, I would have it filled out before hand. Interestingly at POP, leaving for the Miami flight a month earlier, no one requested any forms other than my negative covid test which I needed to present prior to even getting to the ticket agent or the Kiosk area in the airport. In the US, at immigration in Miami, I was never asked for this form nor, strangely, I was not asked to see my passport or even to have it stamped, though I did enter through the Mobile Passport line. Better to be prepared, makes the flight more pleasant.
Good Travels.
P.S. LAX was not busy at all, coming in or leaving but Miami airport was as usual, a full house.