(aviation) economy class

エコノミークラス症候群: economy class syndrome, deep vein thrombosis

(pathology) economy class syndrome, deep vein thrombosis

a ticket

an airplane, aeroplane / (obsolete) Clipping of 空中飛行機 (kūchū hikōki): a flying machine

(software engineering) class diagram - A type of static structure diagram that describes the structure of a system by showing the system's classes, their attributes, and the relationships between the classes.

being economical

(education) class (group of students in a regularly scheduled meeting with a teacher) / class of things (typically products) sharing certain features / (programming, object-oriented programming) class

to buy / to value, to appreciate, to have a high opinion of someone / to provoke someone, to stir

a scratch ticket