Typically, much of your interline travel can be done online, except for ID#% somethings. ID are % off (by airline) and zeds are mileage based (L-M-H) Some zeds are ezeds and some are paper tix bought at counters. They should be chargeable on your credit card. I would always leave a CC # w/him or spouse for changes if there are any issues.
He should be able to print out a list of zed/ID partners. We currently have about 50 ezed partners and a sep list of ID% offs.
We have a small army of other airline folks here to help you with loads. Don't bet on anyone here being from Air Malta or Estonia Air, but you never know...
You can also join ASU Guide (or a similar company), for a fee, and get Tripcheck.