Howdy y'all. I'm pretty new to soccer betting, have only bet a few USA games here and there and a couple MLS games as well, but I was looking for some information in regards to all the various major tournaments/leagues around the world that incorporate a home and home aggregate type of format. I don't really care about capping knockout stage type of matches or pool play type of matches, mainly just looking at home and home aggregate games.

Do most of the leagues around the world use this format? Could someone name some specific leagues or tounaments that use this format.

I know MLS does, Concacaf Champions League does, Euro 2012 has used it for qualifying this year (is this a new development? I was looking at Euro 2008 and can't find any sort of qualifying aggregate).

Any help would be greatly appreciated! Thanks!