It's part of the grounding process.
Officials are investigating the cause of the grounding.
The engineering group fell 7.8p to 429.4p in the wake of the grounding of Boeing's 787 Dreamliner airliners.
As the shock of the grounding reverberated around Australia over the weekend, Ms Gillard's Labor government intervened.
The airlines say they have suffered huge losses because of the grounding of domestic flights immediately after the attacks and the drop in air travel since then.
For three or four days last week, Mr. Mullin said, the industry had almost no revenue because of the grounding of all flights.
In addition, the Coast Guard announced Tuesday that it would conduct a comprehensive marine casualty investigation of the grounding of the Kulluk on Dec. 31.
That is partly because of the grounding of a cargo ship, the Rena, off a North Island beach in 2011, and a subsequent oil spill.
"This boundary is very important because that's where the ice detaches from the bed and becomes afloat and frictionless," says Li of the grounding line.
Dozens of Qantas flights have been delayed as a result of the grounding, forcing Australia's biggest airline to charter aircraft from British Airways to help fill the backlog.
Instead, because of the broad nature of the attacks on the country itself, the complexity of the grounding of American's entire fleet and the need to put in place new security requirements, he stayed at headquarters.
