I noticed that Virgin America uses a 12-hour time format, while Qatar Airways always uses a 24-hour time format.
1:00AM = 0100H
9:00PM = 2100H
12am = 0000H
12pm = 1200H
Is it okay to use 12MN or 12NN if I choose the 12-hour clock time?
Which time format would be more convenient and understandable for flight bookings?