Am I allowed to eat cut up fruits served on the plane or airport lounges?
Assuming that the fruits are not from Israel and there are no issues of terumos u’maasros, the issue is only if the fruits were cut up with a knife that was used to cut non kosher and isn’t clean and washed. It really depends on the reality of each individual place. In consultation with a kashrus expert, he said that it is not an issue and they may be eaten.
R’ M. Kuber shlit”a