Does the airline industry engage in 3rd degree price discrimination?
Obtain some price data, choose any city-pair and two competing airlines
For each airline, obtain four prices for a typical round-trip, itinerary with bookings one day in advance, and then for 1, 2, and 4 weeks in advance of the departure date.
Itineraries should depart and return the same days of the week at approximately the same time of day. Try to avoid the influence of holidays or other seasonal effects on demand. Use airlines' websites for all fare information.