Returning to the original subject, I'd like to suggest Peter Doggett's There's A Riot Going On, subtitled "revolutionaries, rock stars and the rise and fall of 60's counter culture."
The Airplane are mentioned several times, and there are some interesting quotes from the band members, many of which I'm not familiar with (er, the quotes, that is, not the band members).
There's a comment from Spencer about shooting down cops in the street (bet that one went down well with the SFPD), but Dogget later shows up the band's alleged hypocrisy by pointing out a sign on the 2400 Fulton Street house saying "Eldridge Cleaver (Black Panther leader) welcome here," although Paul later admits that may well not be the case. Underground critic Ed Leimbacker susequently accuses the band of "...theatricality. Harmless words and grand gestures rather than truly radical action."
This is probably a fair comment, I think, as even Jorma has described Paul as "very politically naive." But then Paul counters by saying "We didn't feel we had to shoot anybody. Our weapons were intellectual...our watchword was 'question authority.' "
This is all interesting stuff, but one of my favourite quotes in the book has Doggett describing Grace as "the only prominent woman who was able to demonstrate independent thought and action in the rock world of 1968." He's probably not too wide of the mark there.
Airplane aside, the book is a good read generally, and I'd highly recommend it.