American Airlines: This airlines also provide the flexibility to hold flight reservations via a new option "Extended Hold".
Hawaiian Airlines: allow travelers to hold the flight ticket for up to 7 days with a rate variation of $7 to $9.
Delta Airlines: For this airline, you can only hold both air and hotel packages for 24 hours. For 24 hours you do not need to pay any amount, it's free.
Virgin Atlantic: Provides you the option to hold the flight reservation for up to 3 days. The price will vary day by day(approximately $10 to $15).