Definition of ETHYLENE. 1. : a colorless flammable gaseous unsaturated hydrocarbon C2H4 that is found in coal gas, can be produced by pyrolysis of petroleum hydrocarbons, and occurs in plants functioning especially as a natural growth regulator that promotes the ripening of fruit.2.: a divalent hydrocarbon group C2H4 derived from ethane.. : a colorless flammable gaseous unsaturated hydrocarbon C2H4 that is found in coal gas, can be produced by pyrolysis of petroleum hydrocarbons, and occurs in plants functioning especially as a natural growth regulator that promotes the ripening of fruit.
At the time you made the change, a flight for the new dates was selling for $500. To switch to that flight, United would charge a $200 change fee, plus another $200 for the fare difference ($500 minus $300). So the change would cost $400 overallâor more than the original ticket cost! And thatâs on top of the $300 spent on the initial booking.
The cost of changing a flight or flight date can vary from Â£15 per person plus fare up to Â£40 per person. The price for changing the name on a ticket varies from Â£25 per person with up to Â£120 and some airlines don't allow you do it at all.