Originally Posted by
CDKing
I believe Google has messed with their setting to make the site unreliable in order to push people to google.com/flights
So it's not just me who has become a little disenchanted with ITA Matrix.
It is still my go-to.
If the OP has specific questions about Advanced Routing Codes he should post them. There's a vast base of FT experience with Matrix.
Otherwise I offer this as a template for Matrix searches:
All DL-coded flights
Fixed departure
variable return +/-2 days
no change of airports (no LGA-JFK nonsense)
max 1-stop each way