I booked a business class for the next flight.

I will take a flight in economy class.

They (referring to women or girls) are my best friends.

I will abstain from attending this meeting.

He specializes in the study of fish claspers.

We are participating in this project by delegation.

Please remember to bring your admission ticket.

I distributed materials to all participants.

Long-haul flights increase the risk of economy class syndrome.

You must be careful of economy class syndrome on long flights.