FILE- In this Dec. 1, 2010, file photo, a Delta plane comes in for landing over an American Airlines plane at Dallas Fort Worth International Airport in Grapevine, Texas. American Airlines and Delta are reviving a deal that lets them put passengers on each other's planes when travelers are stranded by disruptions such as winter storms and computer outages. The new deal took effect on Wednesday, Jan. 24, 2018. (AP Photo/LM Otero, File)