Both Singapore Airlines and Thai Airways will add few charter flights to Taiwan.
Flights to Kaohsiung will increase from 3 to 6-8 weekly flight between April and May. However, the additional 3-5 flight (SQ8975/8976/8978) will only operate on certain dates.
Original SQ877/878 will operate by A310, SQ8975/8976 will operate by B777.
Thai Airways will fly (seems like trial flight or charter flight) from Utapao (a resort destination near Pattaya Thailand) to both Kaohsiung and Taipei.
Flights to Taipei from Utapao will operate on 4/10 and 4/11, while to Kaohsiung (one-stop at BKK) will operate on 4/17 and 4/18. Both operate by A330.