AN UNBIASED VIEW OF ICELANDAIR TICKET CHANGE

what is actually "jam" imply in "The space reeled and he jammed his head down" (along with the sentence itself)? Refundable and Non-Refundable Fares: Passengers with refundable fares can receive a whole refund on cancellation. Non-refundable fare holders get journey credits, which can be employed for foreseeable future journey. Customer Service A