GHB (gamma-hydroxybutyrate) is produced naturally in the human body in very small amounts. When taken as a recreational drug, and especially when taken in combination with alcohol or other drugs, GHB can be extremely dangerous. GHB is a central nervous system depressant.
International flights always allow carry-on luggage, but each airline has its own restrictions as to quantity, size and weight. Some international carry-on policies restrict bag weights to 11 lbs. or less, while domestic flights rarely have a weight limit.
JetBlue Airlines. JetBlue, while not totally free, does offer some free baggage options for domestic flights. JetBlue baggage policy includes one checked bag free of charge. A second checked bag is allowed for a fee of $30 and a third bag for $75.