The Terms & Conditions of an Alaska Airlines discount code I received reads as:
Transferability: Discount Codes are issued in the name of the traveler and are not transferable. When used, the name on the Discount Code must be the purchaser and/or one of the travelers. It may not be sold, bought, bartered, auctioned or collected in bulk. Any deemed by Alaska or Horizon to have been distributed or acquired improperly will not be honored and traveler will be liable for payment of full fare.
What is the purpose of that "and"?
The truth table seems like it would be the same with or without it and I'm confused.
Can I book a flight for a friend using my credit card?
Edit: OK, one thing I could assume is that and/or is used for people that don't understand the difference between "and" and "or" and instead think "or" means "xor". So someone might assume that "purchaser or traveler" would be false if purchaser and traveler were the same person, so the legal people add an "and" despite it only being false if it was an xor.