flash
先程と同じニュース中から表現を見てみます。
ブログでもflashに纏わる記事が多数あり、「ぴかっと光る」（『ジーニアス英和辞典 第３版』大修館）等の語義でお馴染みの単語ですが「（（略式））＜物＞を｛人に｝ちらっと見せる」（ibid）の他に「・・・を｛人に｝見せびらかす」（ibid）という定義もあります。(Shou-VR*)
EasyJet threatens not to let passenger board after he criticises airline on Twitter
“At this point everyone else had boarded and I said to him that he needed to make up his mind whether I would be allowed on the flight or not. He then asked the woman if I did have any bags on board but decided to let me on the flight. He only really let me on the flight because I flashed my law lecturing ID and I don’t like doing that. “
