https://community.hitachivantara.com/discussion/moreinfo-how-long-before-a-united-flight-can-i-check-in-24hrsonerule
https://community.hitachivantara.com/discussion/moreinfo-how-long-before-a-united-flight-can-i-check-in-24hrsonerulehttps://community.hitachivantara.com/discussion/moreinfo-how-long-before-a-united-flight-can-i-check-in-24hrsonerule