Is a stopover in SIN + the end of a surface secor allowed ?
i.e. SYD-SIN stopover, SIN-xx_......xx_-SGN, surface to SIN, SIN-BNE.
Also, is the end of a surface sector counted as a stopover ?
i.e. SIN-LHR stopover, surface to MAN, MAN-MAD-xx_..... is MAN considered a stopover ?