Futon Critic lists OUAT skipping October 9th. It turns out that all networks will be airing the 2nd Presidential Debate that night, so Futon probably expects ABC to not air it that night as a result:
http://www.thefutoncritic.com/showatch/once-upon-a-time/listings/
http://www.thefutoncritic.com/listings/2016/10/09/
Granted, the debate isn’t even scheduled to air til 9pm that night, but there’s a chance that ABC still won’t air OUAT for the sake of keeping their Sunday shows aligned. They may also opt to have a pre-debate news special in OUAT’s slot. Still, it’s gonna feel awkward if we get a week off already after only airing 2 episodes. Better than getting interrupted for last minute breaking news coverage, which happened often for ABC shows airing during the primaries. This is why I hate election season.