FlyerTalk Evangelist
Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: BA Silver, TK E+, AA PP, Hyatt Globalist, Marriott LT Plat, Hilton Diamond
Posts: 13,046
Last time I did this (but all on AV), my luggage was checked all the way through to CTG. No need to collect in BOG and drop off after customs... I was a bit skeptical but it worked fine. I imagine there would be no difference with a single ticket IB/AV.
You will need to walk through customs yourself and walk over to the domestic wing and go through security again. If you are flying to one of the main Colombian cities your flight will leave from the main building. IIRC flights to some smaller airports depart from a satellite terminal.