Of course, cakes can be carried with you. You just need to go through the security checkpoint, but liquids can't be carried with you. Whether it is 1.5 inch or 15 inch, it can be carried as long as the weight is not over.

Aircraft contraband:

The following are examples of prohibited items:

(a) Firearms, including shotguns, air guns, animal anaesthetic butchers, shotguns, flare guns, starting rifles, ammunition, copied or imitated firearms and crossbows.

(b) Explosives, including military, commercial or homemade explosives, explosive devices, detonators, tear gas bullets, grenades, mines and other explosive ammo, copied or imitated explosives or devices.

(c) Sharp or bladed objects, spring folding knives, gravity spring folding knives, short swords, daggers, wide-headed machetes and other real or ceremonial knives, regardless of the length or type of their blades, including sheathed knives, short swords, small sabres, razors, scalpels, broken ice cones, swords, swords sticks, umbrellas with hidden blades and harpoons.

(d) Articles containing disabling substances, including tear gas, mace tear gas and various phosphorous acid.

(e) Highly flammable substances (such as gasoline, lighter fuel, etc.).

(f) gas containers and sprayers with a capacity exceeding 500 ml.

(g) Copper knuckles, bats, clubs and flails for threshing.