Polynesian Airlines says it hopes to lease an aircraft while its twin otter plane is grounded for maintenance.The plane will be out of commission for a month from this Wednesday during one of the busiest travel seasons on the inter-Samoa route.The airline's new General Manager Seiuli Tuala Alvin says they hope to secure a replacement aircraft, and he is thinking long-term about a bigger plane to service the increasingly popular route.\We need to start to expand a little bit in terms of getting a larger aircraft that can service this market. This market is our core market and we need to look after it