Air France and United have already commenced bookings for travel from Paris and Newark to India, while Lufthansa is yet to open inbound sales
Indian private carriers will also be given an opportunity to fly on such long-haul routes, provided they operate wide-body aircraft for such flights
Activists from multiple unions protested at Air France headquarters at Paris' Charles de Gaulle Airport as talks began Friday
Air France, for its part, said that "discussions are still under way" with unions.
The letter said several of the company's corporate clients had ordered their staff to cut back or eliminate travel
Both carriers are part of Delta-led JV that controls 23% of passenger and cargo capacity between Europe and US
The expanded joint venture replaces two previously approved arrangements in the US-United Kingdom and US-Continental Europe markets
Airlines holding annual talks in Seoul this weekend will seek to restore confidence strained by the two recent Boeing crashes
The airline group also has a new CEO, Canadian Benjamin Smith, who was previously chief operating officer of Air Canada
Joon which is billed as a budget brand will take over Paris-Mumbai route from June 18
CEO of Air-France-KLM group, Jean-Marc Janaillac called strike was regrettable and agressive
Air France-KLM Group's French arm will honour 83% of its scheduled long-haul flights and 86% of its domestic ones on Sunday
The move may disrupt transport plans for football fans on the second day of Europe's football championship