I understand that "direct" is often used as an adverb now but I'm surprised at the comments that "directly" is wrong. I see the adverb "direct" as a shortened form of the adverb "directly". Other similar adjectives also used as adverbs are "smooth" and "slow".
goes direct vs goes directly
One of its definitions (in its role as an adverb) in the WR dictionary is "directly".
direct: adv. in a direct manner; directly; straight: We flew direct to Moscow.
The same page also has this note headed
Related Words:
DIRECT is an adjective and a verb, DIRECTLY is an adverb, DIRECTION is a noun: He is a direct person and always tells you what he's thinking. She directs movies. He answered the questions directly. In which direction is the wind blowing?
"Direct" and "directly" don't have to mean "non-stop". They mean "in a direct manner" or "in a straight line". A ship sailing from Kuwait to India just has to go south-east down the Persian Gulf and continue south-east to go directly to India; it doesn't matter if it stops for some time in mid-sea.
This thread talks of direct flights:
opposite of a non-stop flight