Feds review Asiana's post-crash support US federal transportation officials are investigating whether Asiana Airlines failed to support the families of passengers after one of its planes crashed at San Francisco International Airport, killing three passengers. It is the first time the US Department of Transportation has been concerned enough to investigate how an airline handled legal obligations to provide a range of post-crash services. Those include promptly posting a toll-free number and flying in family members to comfort injured loved ones. Citing its ongoing investigation, the Department of Transportation declined to detail its specific concerns. The Associated Press found the South Korean carrier had ignored a government request for updated emergency contact information and didn't post a toll-free number as quickly as promised. Asiana spokeswoman Lee Hyomin declined to discuss the airline's family assistance plan, other than to say that Asiana publicised toll-free numbers in the US, Korea and China, and used emails and phone calls to communicate with the families of passengers. A review by AP of the "family assistance plan" Asiana filed with the government showed the airline did not keep several important assurances, including that it would keep its emergency contact information current and post a public information number within an hour. The first record AP found of a publicly circulated number was just over three hours after the crash, but that was to an automated Asiana reservations line. The following day, the airline posted a different number, which it then changed several days later. Airlines face up to a $US27,500 ($A29,454) penalty for each family assistance law violation.