$7500 RT would be a combination of J ($4000) and C ($3600) fares and nearly worst case scenario.




The last date in April with flights with Z class open in the JFK-LAX direction is currently April 19th. After the 19th, it's all I and higher inventory. LAX-JFK direction is pretty much the same way. An I fare in each direction would be $2400 + $2400 = $4800 roundtrip. There's some peak surcharge dates in March. The $2100 fares below on March 13th and 14th are actually $1600 Z fares with a $500 surcharge added on.