Originally Posted by
ruckzac
I thought OU is upgrade inventory reserved for instruments (miles/certificates), where as RU is inventory reserved for complimentary Medallion upgrades. Am I wrong?
OP and RP are what you're thinking of. The R or O is because some flights use JCDZ buckets while some use FGAP buckets. JCDZ flight free upgrades are OU and FGAP flight free upgrades are RU.