"We are concerned absolutely ... we have (just) delivered five MAXs. We will continue to work with them," Dinesh Keskar, Senior Vice President (Sales and Marketing for Asia Pacific and India) at Boeing Commercial Airplanes said.
When asked whether he is concerned about financial stability of the airline, Keskara said, "it is ... sustainability", adding that fare levels seen in the last two-three months in the country's domestic airlines sector are a concern.
While the operating cost of airlines has increased in recent months mainly due to higher oil prices, fares have not been hiked much amid stiff competition.
There are entities that have deep pockets with funds and others that have working capital, literally, on a day-to-day basis, he noted without elaborating on any specific issue.
Currently, Jet Airways Group has 123 aircraft, including Boeing 777-300, 737 MAX and 737s.
Faced with financial problems, there has also been delay in payment of salaries to staff at Jet Airways.
Speaking to reporters here on the sidelines of a function to mark SpiceJet inducting its first Boeing 737 MAX 8 aircraft, Keskar said Indian carriers have placed orders for more than 400 Boeing 737 MAX planes.
If SpiceJet decides to go for low-cost long haul services, then "I am sure we will be able to convince him (Ajay Singh) to go (with) Boeing 787," he said.
The no-frills airline, helmed by Ajay Singh, placed orders for up to 205 B 737 MAX aircraft in 2017.
"We are keeping a watch on Jet (Airways). So far, they have not come for any help," Civil Aviation Secretary R N Choubey said.