Code of Federal Regulations Title 39. Postal Service § 39.121.1 First–Class Mail

(a)(1) Until January 5, 2015, a 1–day (overnight) service standard is applied to intra–Sectional Center Facility (SCF) domestic First–Class Mail® pieces properly accepted before the day-zero Critical Entry Time (CET), except for mail between Puerto Rico and the U.S. Virgin Islands, mail between American Samoa and Hawaii, and mail destined to the following 3–digit ZIP Code areas in Alaska (or designated portions thereof):  995 (5–digit ZIP Codes 99540 through 99599), 996, 997, 998, and 999.

(2) On and after January 5, 2015, a 1–day (overnight) service standard is applied to intra–SCF domestic Presort First–Class Mail pieces properly accepted at the SCF before the day-zero CET, except for mail between Puerto Rico and the U.S. Virgin Islands, and mail destined to American Samoa and the following 3–digit ZIP Code areas in Alaska (or designated portions thereof):  995 (5–digit ZIP Codes 99540 through 99599), 996, 997, 998, and 999.

(b)(1) Until January 5, 2015, a 2–day service standard is applied to inter–SCF domestic First–Class Mail pieces properly accepted before the day-zero CET if the drive time between the origin Processing & Distribution Center or Facility (P & DC/F) and destination Area Distribution Center (ADC) is 6 hours or less;  or if the origin and destination are separately in Puerto Rico and the U.S. Virgin Islands;  or if the origin or destination is in American Samoa or one of the following 3–digit ZIP Code areas in Alaska (or designated portions thereof):  995 (5–digit ZIP Codes 99540 through 99599), 996, 997, 998, and 999.

(2) On and after January 5, 2015, a 2–day service standard is applied to intra–SCF single piece domestic First–Class Mail properly accepted before the day-zero CET, inter–SCF domestic First–Class Mail pieces properly accepted before the day-zero CET if the drive time between the origin P & DC/F and destination SCF is 6 hours or less, Presort First–Class Mail properly accepted before the day-zero CET with an origin and destination that are separately in Puerto Rico and the U.S. Virgin Islands, and intra–SCF Presort First–Class Mail properly accepted before the day-zero CET with an origin or destination that is in American Samoa or one of the following 3–digit ZIP Code areas in Alaska (or designated portions thereof):  995 (5–digit ZIP Codes 99540 through 99599), 996, 997, 998, and 999.

(1) Both the origin and the destination are within the contiguous 48 states;

(2) The origin is in the contiguous 48 states, and the destination is in any of the following:  the city of Anchorage, Alaska (5–digit ZIP Codes 99501 through 99539);  the 968 3–digit ZIP Code area in Hawaii;  or the 006, 007, or 009 3–digit ZIP Code areas in Puerto Rico;

(3) The origin is in the 006, 007, or 009 3–digit ZIP Code areas in Puerto Rico, and the destination is in the contiguous 48 states;

(4) The origin is in Hawaii, and the destination is in Guam, or vice versa;

(5) The origin is in Hawaii, and the destination is in American Samoa, or vice versa;  or

(6) Both the origin and destination are within Alaska.

(1) The origin is in the contiguous 48 states and the destination is in any of the following:  any portion of Alaska other than the city of Anchorage (5–digit ZIP Codes 99501 through 99539);  any portion of Hawaii other than the 968 3–digit ZIP Code area;  or the U.S. Virgin Islands;

(2) The destination is in the contiguous 48 states and the origin is in Alaska, Hawaii, or the U.S. Virgin Islands;  or

(3) The origin and destination are in different non-contiguous states or territories, excluding mail to and from Guam and mail between Puerto Rico and the U.S. Virgin Islands.