This week's schedule sucks. 9-4 most days with 9-3 on Wednesday.
As for the location, there were a lot of police around last week. I spoke to one LEO when I was there and they have come to understand the hobby but don't want such "long lenses". The 400 definitely would be attracting too much attention, and I fear the 300 would be the same. I quickly tested the location using my 70-200 and it was more than enough for me. I was getting tight on an E190 at 180mm. Unless you want a closeup of the nose or front half...
However, before I worry about that. Find out your dad's schedule and hopefully it coincides with my school schedule. From what I have seen on the flghtaware a lot of the PHL
US Air A330s arrive between 13:30 and 15:30. I could be wrong though.