Cathay Pacific Airways will raise fuel surcharges on most passenger flights from August 1, the Hong Kong-based carrier announced. The increase — the first since April — is attributed to rising jet fuel prices and escalating tensions in the Middle East, according to separate sources.

The passenger fuel surcharge increase will be up to 41 percent, according to a source familiar with the matter.

One source attributes the surcharge adjustment to surging jet fuel prices. Another source attributes it specifically to escalating tensions in the Middle East.

This is the first increase to both passenger and cargo fuel surcharges since April, according to the carrier. Despite the hike, fuel surcharge levels remain below their peak reached in April, as reported by a source.

The fuel surcharge increase also applies to cargo flights, the carrier confirmed.