Ganz offensichtlich nicht, Gabelflüge stehen in keinerlei Zusammenhang zu Stopover.
Relevant ist folgender Teil der fare rules:
OPEN JAWS
FARES MAY BE COMBINED ON A HALF ROUND TRIP BASIS
-TO FORM SINGLE OR DOUBLE OPEN JAWS.
A MAXIMUM OF TWO INTERNATIONAL FARE COMPONENTS
PERMITTED.
MILEAGE OF THE OPEN SEGMENT MUST BE EQUAL/LESS THAN
MILEAGE OF THE LONGEST FLOWN FARE COMPONENT.
PROVIDED -
THE OPEN SEGMENT MUST BE
WITHIN
-WITHIN ITALY OR WITHIN AREA 3
COMBINATIONS ARE WITH ANY F-/A-/J-/C-/D-/Z-/P-/G-/E-/
N-/Y-/B-/M- TYPE FARES FOR CARRIER LH/OS/LX/SN/EW/SQ
WITH ANY RULE IN ANY PRIVATE TARIFF.
EDIT: Bsp für SIN, je nach Ziel dann AREA 1 oder 3 bzw "WITHIN AFRICA".