Aloha Airlines said all of its interisland flights were on time, although the company said its Orange County to Honolulu flights were delayed to due gate availability at John Wayne Airport.

Hawaiian Airlines, the state's largest carrier, said four of its 100 daily interisland flights experienced delays 20 minutes or less this morning.

Go!, the new interisland carrier, also said it didn't experience delays this morning and said it doesn't expect any significant impact on its Hawai'i operations as the security risk lessens.

"We have not seen, at this point, any significant impact on our operations in Hawai'i," said Jonathan Ornstein, chief executive officer of Phoenix-based Mesa Air Group, which owns Go!

"I don't see it as having a big impact on the Hawai'i flights for any period of time."

The local airlines are recommending that passenger arrive 90 minutes to two hours before their flights after airport officials tightened security at Honolulu Airport. Homeland Security officials raised the threat level to orange — or high alert — after British authorities thwarted a plot to use liquid explosives on U.S. bound airlines.