=+(consisting of the $3.60 flight segment tax plus the $2.50 September 11 fee). According to data from the Bureau of Transportation Statistics, in 2015, 643 million passengers traveled on domestic airline trips at an average price of $380 per trip. The accompanying table shows the supply and demand schedules for airline trips. The quantity demanded at the average price of $380 is actual data; the rest is hypothetical.

Price of trip | Quantity of trip | Quantity of trip demanded (m| s supplied (mill illions) ions)

$380.02 642 699 380.00 643 698 378.00 693 693 373.90 793, 643 373.82 913 642