Is Air AMS filing required for cargo that arrives aboard an aircraft, is not unladen and subsequently exported from the United States aboard the same aircraft?

Is Air AMS filing required for cargo that arrives aboard an aircraft, is not unladen and subsequently exported from the United States aboard the same aircraft?

Yes. Such cargo meets the definition of Foreign Cargo Remaining On Board (FROB).  Air AMS will include a new indicator in the transfer line for purposes of identifying such cargo as FROB. (TRN/R)  This indicator will be used for simple and master air waybill records. 

House air waybill records must be reported for consolidated shipments even though the FROB indicator need not be used for the house air waybill records.  The FROB indicator at the master air waybill level will be applied to all associated house air waybills.