Gate cards

One page per airline: its own second-seat policy, dated and sourced, a QR code to the airline's policy page, and blank lines for your booking details. Print it or save it to your phone. You will probably never need it; carrying it changes how the conversation goes anyway.

• AA American Airlines
  Second seat at same fare; call ahead
• DL Delta Air Lines
  Extra seat expected if encroaching
• UA United Airlines
  Extra seat required if encroaching
• WN Southwest Airlines
  Free at airport only if seats open (2026 policy)
• AS Alaska Airlines
  Second seat; refunded if flight had open seats
• B6 JetBlue
  No size policy; extra seat optional
• F9 Frontier Airlines
  Second seat required if encroaching
• G4 Allegiant Air
  Second seat at booking; armrest test
• HA Hawaiian Airlines
  Second seat; refunded if flight had open seats
• AC Air Canada
  Free extra seat within Canada (medical form)
• BA British Airways
  Extra seat required if you cannot fit
• LH Lufthansa
  Second seat at net fare; book by phone
• AF Air France
  Second seat 25% off; refunded if flight not full
• KL KLM Royal Dutch Airlines
  Extra seat ~75% of fare via customer service
• EI Aer Lingus
  Extra seat at full fare

Each card reflects the policy as verified on the date it shows; the airline's page carries the full figures and sources. Policies change, so reprint before a trip if your card is more than a season old.