Bottom line: If it's not rock-hard solid, leave it out of your carry-on luggage.

Exceptions are:

If you are traveling to or through Britain, harsher security measures are in place at this writing: The only carry-on items allowed are ID, wallet, boarding pass, prescription medications and baby formula, breast milk or juice IF traveling with children — all presented in a clear plastic bag. You may be asked to sample liquids. (This is being done only in the United Kingdom.)

Aloha Airlines suggests arriving three hours early for Mainland or international flights, two hours early for interisland flights. All footwear is screened, so wear slip-on shoes and don't wait to be asked to take them off and put them in the tray at the checkpoint. A second security search will take place at the gate just before boarding; keep your ID handy.

For the best chance of breezing through security, follow the procedures for Britain described above. Place anything you can't live without — ID, valuables, papers, reading material, sweater, neck pillow — in a clear plastic bag. Minimize jewelry. Empty pockets.

Portable electronic devices are allowed but must be screened (and all laptops must come out of their cases at checkpoint). To save hassle, pack your computer in a padded, hard-side case and check it. Turn off your cell phone — it won't kill you — and place it in a checked suitcase.

Of course, knives, scissors and all other sharp objects continue to be prohibited aboard aircraft.

Questions?

Call your airline or travel agent in advance or check www.tsa.gov for the latest updates.