You can readily identify an e-Passport, because it has a unique international symbol on the cover. Electronic System for Travel Authorization (ESTA) ESTA is an automated system that determines the eligibility of visitors to travel to the United States under the Visa Waiver Program (VWP). Authorization via ESTA does not determine whether a traveler is admissible to the United States.
Two to three weeks before the flight date, the price quotes start increasing. This is the time when business travelers start booking. While price drops are still possible, a chance of a price increase is much higher if you wait to book within this time period.
Midwest says that if the price drops within seven days of purchase you can get a refund of the price difference for no fee. But with fares booked months out, it might take weeks to see a price drop. All of the airlines will give you a price break if your specific flight does suddenly get cheaper. But it will typically cost you. While Alaska, JetBlue and Southwest don't charge anything, AirTran and Virgin America charge $75 (Virgin's change fee will rise to $100 in November) and Hawaiian and Midwest charge $100.