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What the flags mean in dig output ? (aa, qd, qa etc.)

From http://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-12 :

bit 5 	AA 	Authoritative Answer 	[RFC1035]
bit 6 	TC 	Truncated Response 	[RFC1035]
bit 7 	RD 	Recursion Desired 	[RFC1035]
bit 8 	RA 	Recursion Allowed 	[RFC1035]
bit 9 		Reserved 	
bit 10 	AD 	Authentic Data 	        [RFC4035]
bit 11 	CD 	Checking Disabled 	[RFC4035]

And from RFC 1035, QR is

a one bit field that specifies whether this message is a query (0), or a response (1).

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