Liquids or gels not allowed in passenger cabins:

• Beverages
• Shampoo
• Suntan lotion
• Creams
• Toothpaste
• Hair gel

The TSA permits:

• Baby formula, which must be presented for inspection at the checkpoint
• Prescription medicines that match the passenger’s name
• Essential nonprescription medicines, such as insulin
• Electronic items such as laptops, CD players and iPods; British Airways flights to Britain do not allow them.

British Airways PLC, the largest carrier between Britain and the United States, offers these guidelines for carry-on items. Allowed in the cabins:

• Pocket-size wallets and pocket-size purses, such as money, credit cards and identity cards
• Travel documents essential for the journey such as passports and tickets
• Prescription medicines and medical items sufficient and essential for the flight (for example, a diabetic kit), except in liquid form unless verified as authentic
• Spectacles and sunglasses, without cases
• Contact lens holders, without bottles of solution
• Female sanitary items sufficient and essential for the flight, if unboxed, including tampons, pads, towels and wipes
• Unboxed tissues and handkerchiefs
• Keys, but no electrical key fobs.

For those carrying an infant on a British Airways flight, the following are allowed:

• Baby food and milk, but the contents of each bottle must be tasted by the accompanying passenger
• Sanitary items sufficient and essential for the flight, such as diapers, wipes, creams and diaper disposal bags.