SINGAPORE (THE BUSINESS TIMES) - Singapore stocks started the week stronger, led by gains in aviation-related counters, amid mixed trading in the region. The benchmark Straits Times Index (STI) rose 0.35 per cent to close at 3,106 on Monday. Soaring to the top of the STI table was flag carrier Singapore Airlines, which rose 6.2 per cent to close at $5.63, the highest in a year. The gains follow reports that Singapore and Australia are in talks for a potential air travel bubble to allow for quarantine-free travel. Other aviation-related stocks also closed higher. Sats rose 3.4 per cent to $4.52 while SIA Engineering climbed 5.1 per cent to close at $2.26.