Holland America offers interline discounts on select sailings to Vacations To Go customers: Active & Retired employees of IATA/ARC appointed international and regional airlines. This includes retirees of defunct airlines; Active & Retired Courier/cargo airlines (FedEx employees and UPS employees – Excluding drivers); Charter Airlines Employees of GDS suppliers (Amadeus, Revelex, SABRE, etc.) when booked through and approved interline agency; Active-Air traffic controllers, Air Marshalls, FAA & TSA employees regardless of flight benefits; TripAdvisor employees, must provide copy of IATAN; Widow(er) of active/retired employees; Eligible family members; Furloughed employees maintaining flight benefits. The spouse, parents, parents-in-law and dependent children of an interline eligible guest qualify if the interline eligible guest is not traveling. The current policy allows for up to 3 additional cabins on the same sailing at the interline rate (total of 4 rooms) when the interline eligible employee is sailing themselves. If the interline eligible employee is not actually sailing themselves but instead their eligible family members are travelling without them, then there needs to be an eligible family member in each additional stateroom (up to 4 total).  Qualifying guests must submit a letter of employment verification, a copy of their company photo ID, or proof of flight benefits at the time of booking.