Originally Posted by
studentff
My understanding is that they've relaxed the requirements that airlines give SSSS to passengers that have frequent-flier accounts that are over a certain number of months old and/or have a certain amount of activity. That would exclude most FTers as long as they are flying their preferred airline or alliance.
In both cases where I used two one ways on different airlines to make a round trip (with no SSSS triggered), one half of the trip was on an airline I had not used before, though I did use frequent flyer numbers for mileage partner airlines in order to collect the mileage.