Trouble for Air India is likely to mount as two international law firms are in talks with the families of the June 12 Ahmedabad plane crash for a potential lawsuit against the Tata Group airline to claim legal rights under international laws. The probable lawsuit by the two foreign law firms, including the United Kingdom-based Keystone Law and the United States-domiciled Wisner Law Firm, would be independent of the initiatives like the compensation and setting up of a trust for victims’ families that the Tata Group’s holding company, Tata Sons, earlier announced, the Economic Times reported.