Interesting! If you now do a dummy booking JFK-BOG, you get the following information on avianca.com:

"As of April 6, 2018, flights AV244 and AV245 between Bogota and New York will be operated by WAMOS AIR. As of that date, flights AV020 and AV021 currently operated by that airline, will be once again operated by Avianca."

Finally they made it official!