Back in 2014 I was booking awards for the family fly LHR-LAS-HKG-ADL-SIN-LHR in business.
Getting 4 seats on any flight was impossible but I had it all planned with 2 + 2, we all left on the same day, just on different flights. One of the flights I had booked was LHR-DEN-???-LAS however the last flight only had one first seat so I asked if another could be opened. She put me on hold, then came back and said someone would call me back.
A few hours later someone from the EXP desk called back and had changed all my planned flights and got us all together on all flights. The LHR-DEN-???-LAS, changed to LHR-DFW-LAS all on AA metal, in the new J seats. Through their liaison they'd also got us 4 seats on the HKG-ADL CX flight, only two had been available for awards.