I booked a round-trip airticket (China Eastern Airline) from Los Angles to Shanghai at www.expedia.com. Their website only provides some place for you to input your passport number, but not its issue date or expire date. Are the issue date and expire date required for all the flights to US? I kind of remember that US requires the airline to provide such information before at least 48 hours before the flight? anyone has similar experience? I will leave in two days... Thanks