Originally Posted by
jwgmaldives
..First ticket: JFK --> FRA --> SIN
Second ticket: SIN --> MAL..
As SQ interlines with SQ ... just ask upon checking in.
If they outright refuse, see a transfer desk in the hub of each terminal. Unlike in European airports, these are actually operational.
And in the worst, case, immigration in Changi, getting your bags, and re-checking them, should be easily doable in under 20 minutes. But I doubt that the transfer desk will refuse service to a premium pax.
In Biz, your check in cut off is 30 minutes, so this really should not be an issue.