Seems New-market Hols will not permit changing the flights now (group tour) so have to grin and bear it - fingers crossed
I would go and have a chat to them about what contingency plans are in place should Jet Airways go broke, hopefully there is insurance coverage and you'll be rebooked on another airline. but I would want that in writing.
https://www.bbc.com/news/business-47626409
https://www.indiatoday.in/business/s...281-2019-03-20