Conversation so far:
when were the eagles in the super bowl
The Eagles participated in 3 Super Bowls, Super Bowl XV on January 25, 1981, Super Bowl XXXIX on February 6, 2005, and Super Bowl LII on February 4, 2018
did the philadelphia eagles win a super bowl
In the 2017 season the Philadelphia Eagles won Super Bowl LII, their first Super Bowl win in franchise history

Question: how many league championships has the team won
Self-contained rewrite: how many league championships have the eagles won