Blue Islands airline has criticised rival Aurigny for announcing its new inter-island service.
The route is currently operated by Blue Islands, who say it already loses it money.
It says it is 'difficult to understand' why Aurigny would re-enter the market as figures show almost half of the Blue Islands seats flew empty in 2018.
Blue Islands currently operates up to ten flights per day between Guernsey and Jersey.
Both markets have historically proven to be unable to support a significant oversupply of capacity and availability of fares in the market that fail to cover the costs of operation.
Meanwhile Deputy Joe Mooney, from the Economic Development Committee says there could be more competition for Aurigny with Guernsey to Manchester flights likely to be offered by Flybe.