Some airlines are marked with an * or +. What does it mean?

In the search results on OneTwoTrip.com you may see different flights operated by one, two or more airlines:

If you see an airline marked with an asterisk (*), it means that the flight is operated by two carriers. You need to click on the corresponding link to see the details:

If you see an airline marked with a plus sign (+), it means that the flight is operated by three or more carriers: