ickets purchased from December 10. 2018, 00:01 (EST) through December 16, 2018, 23:59 (EST). Economy Class terms and conditions: Travel period For JFK-MXP & EWR-ATH: January 08. 2018 through May 14. 2019 Travel period for all origins: January 12, 2019 through May 09, 2019 • Travel must be completed on or before