One on One with Korean Airlines’ John Jackson. American and US Airways respond to Justice Department move to block merger. Hyatt Chicago unveils renovations. Hertz streamlines car rental experience. TripIt available on Samsung Galaxy Gear. Qatar joins oneworld Oct. 30. Rivals Expedia and Travelocity ink strategic agreement. Tripcase app integrates American Express. Marriott expands mobile check-in. MasterCard and Travelex roll out multi-currency card. Delta crews get AT&T mobile. Pinterest for travel at Four Seasons.