| Variable | Description |
| Price | Mean airfare for each product, measured in thousands of US dollars |
| Quantity | Number of passengers for each product |
| Interstop | Number of intermediate stops for each product |
| Inconvenience | A product’s cumulative itinerary distance flown from the origin to the destination divided by the nonstop flight distance between the origin and destination |
| HUB_Origin | Dummy variable that equals 1 if the origin airport is a hub for the ticketing carrier and 0 otherwise |
| Tour | Dummy variable that equals 1 if the airport is in Florida or Las Vegas and 0 otherwise |
| Slot_control | Number of slot-controlled airports on a product’s itinerary Note: In 1998, slot-controlled airports are New York LaGuardia (LGA), New York Kennedy (JFK), Washington National (DCA), and Chicago O’Hare (ORD). The slot-controlled ORD expired in 2002, while Newark Liberty (EWR) was added in 2008. |
| Distance | A product’s cumulative itinerary distance flown from the origin to the destination, measured in thousands of miles |
| HUB_MC | Dummy variable that equals 1 if the origin, intermediate stop(s), or destination airport is a hub for the carrier and 0 otherwise. |
| Slot_MC | Dummy variable that equals 1 if the Slot_control variable is greater than zero and 0 otherwise |
| Legacy_mkt | Number of products provided by legacy carriers |
| LCC_mkt | Number of products provided by LCCs |