I can think of one bus network that had routes numbered from 1 up to the 20s but never a 13. Also I am sure there were fleets that went from 1 to 12 then 14 upwards. Any present day examples?
Slightly off topic, but I remember as a teenager having to deliver something to a house numbered 12A in a road where odd numbers were on one side and evens on the other. I recall being puzzled at not being able to find 12A next door to No.12 - eventually I found it on the other side of the road between 11 and 15!
Not as such but when the Chinese bought Ensign/Capital Citybus, they got rid of the blue livery as blue is an unlucky colour.
Similarly, the registered their new vehicles with 888 in them as eight is a lucky number in Chinese culture, I believe
First Kernow has no route 13 that I can think of.
When I lived in Huddersfield I recall First Bus having two ex-London deckers which had registrations L888 TTT and L888 YTT.
In Cheshire when GHA Coaches took over the 288 route it became 88, while the 39 has become 87, they've just registered an 84 service and they have a 82, I think they like service numbers starting with 8.
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In my area I wouldn't think too much of a missing number. 20 years ago there would have been a whole load of services with numbers in the forties but most of the routes have been withdrawn.
And British Airways have a row 13 too, though given the large number of different kinds of aircraft they have you can't draw conclusions about what type of seat it is. However if you travel on a BA plane that was delivered new to British Midland/BMI, these have no row 13. No doubt next time the planes get a cabin update they'll renumber the rows to BA standard.Some aircraft don't have a row 13. easyJet do, and it is the best row on their A320s, being the extra legroom exit row. Definitely lucky if you got it by chance on a full flight rather than paying for it.
I once knew a bus driver who crashed a number 13, driving the 13th type of bus he'd ever driven and was 13 hours from retirement

That's a classic
But is there a chance the driver was paying more attention to the numbers on the bus and clock than the road?
I heard that Lothian renumbered a batch of Tridents so that there would no longer be a 666 in the fleet.
666 used to be one of the Airlink branded busses.
The previous 666 (GSC666X) was partially destroyed in a fire in 1987.
... and partially lives on (see photo caption)