score:9
After posting the TSA information below, I noticed the ryanair tag. Here's what they have to say about sharp objects, emphasis added:
8.10.1.2 Pointed/edged Weapons & Sharp Objects; pointed or bladed articles capable of causing injury, including axes & hatchets, cleavers, arrows and darts, crampons (grappling iron, hooked bar of iron, or plate with iron spikes used in mountaineering), harpoons & spears, ice axes & ice picks, ice skates, knives with blades of more than 6 cms including lockable or flick knives, ceremonial, religious and hunting knives, made of metal or any other material strong enough to be used as a potential weapon, meat cleavers, machetes, open razors and blades (excluding safety or disposable razors with blades enclosed in cartridge), sabres, swords and swordsticks, scalpels, scissors with blades more than 6 cms as measured from the fulcrum, ski and walking/hiking poles, throwing stars, tradesman's tools with a blade or a shaft of more than 6 cms that have the potential to be used as a pointed or edged weapon, e.g.drills and drill bits, box cutters, utility knives, all saws, screwdrivers, chisels, crowbars, hammers, pliers, wrenches/spanners, blow torches.
Source: https://www.ryanair.com/gb/en/useful-info/help-centre/terms-and-conditions/
I'll leave the TSA information in the answer to show that the basic approach is quite consistent from one country to the next.
According to the TSA, in carry-on luggage, you can bring
You cannot bring non-cartridge disposable razor blades in the cabin, but they can be in your checked bags.
Source: https://www.tsa.gov/travel/security-screening/prohibited-items
Other transportation safety authorities have similar rules. I once traveled from Europe to the US with a non-cartridge safety razor in my carry-on bag, but I left the blades behind because I did not want to check any luggage.
Upvote:2
In business class, they have those shavers in the bathrooms. Anyone can grab one there during the flight, so they are obviously allowed and considered save.