Singapore Airlines:

Singapore-Athens effective March 25 will start 2x/week service.
Singapore-Athens effective July 8 to September 30 will increase from 2x/week to 3x/week.
Singapore-Istanbul effective March 25 will be reduced from 6x/week to 5x/week.
Singapore-Munich-Manchester effective March 25-June 5 is being reduced from 1x/day to 6x/WEEK.

ANA:

Osaka-Hangzhou effective March 25 is increasing from 3x/week to 1x/DAY.
Osaka-Qingdao effective March 25 is increasing from 4x/week to 1x/DAY.

South African:

Johannesburg-Pointe Noire effective May 17 will be extended to Johannesburg-Pointe Noire-COTONOU and will operate 2x/week.

Aegean:

Athen-Munich effective March 25 will be reduced from 2x/day to 1x/day.
Athens-Venice effective March 25 will be reduced from 4x/week to 2x/week.
Athens-Vienna effective March 24 will increase from 5x/week to 1x/DAY.
Irakleion-Larnaca effective June 29-September 2 is CANCELED.
Thessaloniki-Larnaca effective March 25 will be reduced from 11x/week to 1x/DAY.

PREVIOUS STAR ALLIANCE UPDATES: ONE TWO THREE

Source: Airlineroute.net