Seat Preference: $10-$20

Legroom and a view now cost more on some airlines: Several American carriers now charge for seat preference within the coach section. JetBlue charges $10 to $20 for popular seats, while Northwest passengers pay $5 to $35 for a seat with more legroom on domestic flights. United Airlines' Economy Plus plan is unique: For a $349 annual fee, one member and his or her companion are seated at the front of economy section whenever possible. Most elite airline members can select seats without the additional fee, but coach travelers should arrive early and ask at the gate for a free seat reservation.