Premium economy shell seats on Japan Airlines. Premium economy is a travel class offered on some airlines. Positioning in price, comfort, and amenities, this travel class is leveled between economy class and business class. In 1991, EVA Air was the first to introduce Evergreen Class and had since become the first airline to offer this class of service in the world.
This sentence has two independent clauses. They are connected by and with a comma before it. The and and the comma are correct. However, adding a comma after thus is not correct because it is an adverb; the comma after it is not necessary. If thus is used as a conjunctive adverb (without and), a semi-colon and a comma are necessary.
Knowing where to use a comma before the word âsoâ is often challenging. Sometimes you need it; other times you should omit it because the context is different. The comma is the most common punctuation mark and the one people wrestle with the most, particularly when it involves words such as so, when, where, which, and however. Letâs look at so. The word so serves as different parts of speech, most commonly as a conjunction, which joins two clauses in a sentence.