正常的，没有什么笑话不笑话的。似乎世界上还没有哪个新飞机不延期的。ARJ21还有两项检验没完成：icing tests 和 stalling speed tests.
Aircraft 104, which is involved in the icing tests, arrived in Urumqi on 27 March. The tests were due to be completed by the middle of 2011, but were not completed.
"There is a delay in the icing test as there is, at present, not enough natural ice in Urumuqi," said the source.
Static tests for the ARJ21 were completed on 14 April and crosswind tests on 24 May. Flutter testing on the ARJ21 started on 4 April, and was successfully completed in Xian on 18 August.
