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All international flights to the US (except those departing from non-US airports with US Preclearance Facilities) clear US Immigration and Customs when first arriving on US soil. Your departure airport HKG does not have a US Preclearance Facility.

Thus, you will have "returned to the United States" at LAX on December 29, 2017.

(Note that this answer does not address a traveler's "arrival date in the US" when the traveler passes US Immigration and Customs overseas in a US Preclearance Facility, and physically arrives in the US on the next calendar day. I don't know the answer to that question.)

All international flights to the US (except those departing from non-US airports with US Preclearance Facilities) clear US Immigration and Customs when first arriving on US soil. Your departure airport HKG does not have a US Preclearance Facility.

Thus, you will have "returned to the United States" at LAX on December 29, 2017.

(Note that this answer does not address a traveler's "arrival date in the US" when the traveler passes US Immigration and Customs overseas in a US Preclearance Facility. I don't know the answer to that question.)

All international flights to the US (except those departing from non-US airports with US Preclearance Facilities) clear US Immigration and Customs when first arriving on US soil. Your departure airport HKG does not have a US Preclearance Facility.

Thus, you will have "returned to the United States" at LAX on December 29, 2017.

(Note that this answer does not address a traveler's "arrival date in the US" when the traveler passes US Immigration and Customs overseas in a US Preclearance Facility, and physically arrives in the US on the next calendar day. I don't know the answer to that question.)

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All international flights to the US (except those departing from non-US airports with US Preclearance Facilities) clear US Immigration and Customs when first arriving on US soil. Your departure airport HKG does not have a US Preclearance Facility. 

Thus, you will have "returned to the United States" at LAX on December 29, 2017.

(Note that this answer does not address a traveler's "arrival date in the US" when the traveler passes US Immigration and Customs overseas in a US Preclearance Facility. I don't know the answer to that question.)

All international flights to the US (except those departing from non-US airports with US Preclearance Facilities clear US Immigration and Customs when first arriving on US soil. Thus, you will have "returned to the United States" at LAX on December 29, 2017.

All international flights to the US (except those departing from non-US airports with US Preclearance Facilities) clear US Immigration and Customs when first arriving on US soil. Your departure airport HKG does not have a US Preclearance Facility. 

Thus, you will have "returned to the United States" at LAX on December 29, 2017.

(Note that this answer does not address a traveler's "arrival date in the US" when the traveler passes US Immigration and Customs overseas in a US Preclearance Facility. I don't know the answer to that question.)

Source Link

All international flights to the US (except those departing from non-US airports with US Preclearance Facilities clear US Immigration and Customs when first arriving on US soil. Thus, you will have "returned to the United States" at LAX on December 29, 2017.