Also, FWIW, using city indicators (LON, PAR, NYC, etc.) can sometimes save a coupon, if you're flying into one airport and out of another.

For example:

MIA AA LGA // JFK CX HKG (three coupons {two segments, one surface})

could be written as:

MIA AA NYC CX HKG (two coupons {two segments}).

Sometimes, it's necessary to ticket segments like this open-dated, then sticker the reservation afterwards.

This trick once saved me several hours of waiting for a ticket that would have had to be hand-written otherwise.