Originally Posted by desi

change to what?

I think jet airways website is pretty clear about separate PNR.
They have also added language about code-share with examples.

Tickets purchased in US follows USDOT regulation which protects only single PNR trips. (Which states that baggage rules of the first segment dictates entire round trip - some airlines may give more allowance when that is typical allowance for that route but they can not give less)

For example United free baggage allowance in Y is 1 bag for US-India sector. Lufthansa has two bags for the same sector.

If you fly EWR-BOM-EWR, in Y, your free baggage allowance for the entire trip is:

1) 1 bag if your ourbound is on United and return is on Lufthansa
2) 2 bags if your outbound is on Lufthansa and return is on United

Doesnt matter which start alliance airline issues the ticket (lately Air Canada is selling this route on other *A operated flight at reduced fare then the operating carriers themselves)

Now it is possible that LH may allow 2 bags at BOM as contracted disinterested ground staff wud be used to check-in 2 bags for US bound pax from BOM on LH. But LH is not required to do so for US purchased tickets.

Now, this is further confused by IATA's MDC rules (Most dominant carrier). Jet airways in India and Jet Blue in USA when connecting with Emirates for example on US-India route. An example where Jet Blue is more generous than USDOT minimum requirement.

Bottom Line: Expect to pay hefty baggage charges if buying separate domestic ticket in India (now of course, this being India, inconsistencies and corruption is always at play)

Single PNR ticket bought in US, avoid first leg on United or American.