Locations involved: Buenos Aires (EZE), Sao Paulo (GRU), London (LHR)
Carrier: Ethiopian (ET)

So R/T EZE to LHR, Business, on ET is $4k+
This flight has a 1:15 stop in GRU outbound, and a 3:20 stop inbound

R/T GRU to LHR, Business, on ET is $1.6k

R/T EZE to GRU, Economy, on ET is $500

These are on the same planes. $4k on a single PNR, $2.1 on separate PNR's. 1:15 is probably not enough time to clear immigration and re-check for the next flight...

Do you think ET would let me check my bags all the way through, and give me a boarding pass in the airside sterile area? Our would they frown upon the obvious ploy to save bux, and strand me?

Anyone pulled this off on another airline?