FlyerTalk Evangelist
Join Date: Feb 2009
Location: From ORK, live LCY
Programs: BA Silver, EI Silver, HH Gold, BW Gold, ABP, Seigneur des Horaires des Mucci
Posts: 14,210
A 30-minute transfer is certainly possible in many locations. Same terminal and domestic to domestic in ORD, I would say fine. Hell, I've done a 1hour 15 minutes international to domestic at JFK changing from T4 to T2 once.