Something like this can be seen on www.airow.com: $ dig www.airow.com @a.gtld-servers.net ...

looks good to me, man. ; <<>> DiG 8.3 <<>> @f.6to4-servers.net www.airow.com a ; (2 servers found) ;; res options: init recurs defnam dnsrch ;; got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 1 ;; QUERY SECTION: ;; www.airow.com, type = A, class = IN ;; ANSWER SECTION: www.airow.com. 2D IN A 66.82.206.10 ;; AUTHORITY SECTION: airow.com. 2D IN NS ns1.rfwwp.com. airow.com. 2D IN NS www.airow.com. ;; ADDITIONAL SECTION: ns1.rfwwp.com. 2D IN A 208.191.129.185 ;; Total query time: 37 msec ;; FROM: stick.isc.org to SERVER: f.6to4-servers.net 2001:4f8:0:2::14 ;; WHEN: Wed Sep 17 14:31:48 2003 ;; MSG SIZE sent: 31 rcvd: 101

After delegation-only, they will start to return 208.191.129.189. Which is probably an improvement, but a change no less.

see above.

So I'm unsure about ISC's approach.

me too.