Https://www.apprenticeship.gov/sites/default/files/webform/naw_submit_your_proclamation/_sid_/United-Airlines-Customer-Service-Number-1-877-245-9984-Complete-Support-Guide-2025.pdf https://www.apprenticeship.gov/sites/default/files/webform/naw_submit_your_proclamation/_sid_/United-Airlines-Customer-Service-Number-1-877-245-9984-Complete-Support-Guide-2025.pdf