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.
For example, CheapAir monitored a 7-day flight from Los Angeles to New York to see how many times the price changed. About 320 days before the trip, the flight cost $357. But about 3 months before the trip, the flight dipped to $318. Overall, the price changed 107 times, going as low as $290 and as high as $597. Rick Seaney, travel expert and CEO of FareCompare, agrees with the three month rule and not booking too far in advance.