I just cancelled my hold on the YYZ-VCE flight and instead booked two seats from YYZ-MAD (longer trip). My status also says 'On Request', with no seats assigned and no ticket number yet. I booked on aa.com.
YYZ-LHR 27DEC AA6210 Booking Class: W
LHR-MAD 28DEC AA6741 Booking Class: Y
MAD-LHR 6JAN AA8805 Booking Class: Y
LHR-YYZ 6JAN AA6207 Booking Class: W
$1441.92 CAD all in (USD $1144.67 US)