Originally Posted by
Star1997
Thanks Supersonic Swinger ! That was an amazing compilation.
I checked out the various programs and it seems like Delta will fit my needs the best. I'm sure I will do more than one flight in 2 years but I like the flexibility offered by Delta.
Thanks again

Korean airline tried to reduce the expiration time 5-6 years ago to match Delta or Northwest. Korean government was against it and gave 3 year (i believe) grace period. Then KE changed the rule. still 5 years is a lot compared to US carriers. I think KE will try to match the rule eventually.
KE and OZ have very unique rules on their program. Family member can share miles and can not issue tickets for non-family members. For example, father has 20,000mile, mother has 20,000miles and son has 20,000miles.
They can issue a ticket for daughter with 60,000miles.