Seven more Chinese airlines have filed claims for compensation against Boeing on Thursday, after China Eastern Airlines filed a similar claim due to the losses suffered from the grounding of 737 Max aircraft over serious safety concerns.

The carriers include Air China, China Southern Airlines, Shandong Airlines, Hainan Airlines, Xiamen Airlines, Shenzhen Airlines and Kunming Airlines, according to media reports.

The airlines refused to disclose any details, but industry insiders said the number could be huge, Beijing Youth Daily said in a report.

“The losses also include maintenance fee and leasing cost during the grounding period … and it has created clear financial impact for the airlines,” an industry insider said.

At an earlier briefing, Lu Kang, a spokesperson for the Chinese Foreign Ministry, said it was “beyond reproach” that airlines would work to “protect their legitimate rights and interests in accordance with the law.”

Meanwhile, American Airlines CEO Doug Parker told NBC Nightly News on Wednesday that “I don’t know … that any amount of marketing” can reassure flyers that the 737 Max is safe.