I saw Aida (admittedly on a weekend) in April, and I arrived there at 8am and there was already 10 people ahead of me. The earlier, the better. (Sorry to sound redundant, but it's true.)
My other suggestion (and I did this successfully-ish for Boy From Oz) is to check Ticketmaster repeatedly to see how well tickets are selling for the date you're trying to catch. That way you have an idea of whether or not it'll be on TKTS and what seats you can expect. And like what J. said, the view is obstructed and it's sort of a pain cuz you can't see a lot of the back of the stage (like the sails in Fortune Favors The Brave) or even the floor (like when Aida and Radames have finished doing their thing after Elaborate Lives), which makes things sort of annoying. Getting TKTS tickets can almost be a blessing in that sense!
In conclusion (sorry, I'm writing this while writing an essay...), if there's 3 of you, I would recommend 2 of you lining up at the Palace B.O. (I'm assuming your friend is also a student, otherwise there might be a problem), and your aunt go line up at TKTS (there'll definitely be a lineup there at 8am too), so you have the option of the best of both worlds.
Good luck! :)
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