The Boeing Co. said a $1.8 billion order from Delta Air Lines helped it set a company record of $47.7 billion worth of airplane orders this year. Boeing's 1990 tally tops by $1.1 billion its previous high mark of $46.6 billion set last year even though the number of planes ordered fell from 1989. Boeing said Thursday that 543 planes were ordered this year, down from 883 last year. The biggest drop came in orders for the short-haul 737-series - 162 planes this year from 463 last year. But the overall dollar amount of the orders increased because of a sharp rise in orders for Boeing's most expensive jet, the 747-400 jumbo. This year, airlines ordered 172 of the 747-400s, which cost between $125 million and $147 million each. Boeing received orders for 68 of its 747-400s in 1989. Delta's order announced Thursday includes six new 767-300 twinjets, which sell for between $78 million and $86 million each. Boeing also disclosed that Delta placed orders earlier this year for three more extended-range 767-300s, an additional standard 767-300, nine 757-200s and seven 737-300s. Boeing spokesman T. Craig Martin said the previous orders included options Delta converted to firm purchases this year and several jets added to earlier orders during the final contract negotiations for those orders.