Delta Airlines (DAL) has seen an impressive rally ahead of the company’s Analyst Day next Tuesday. The entire sector is hot . While DAL gained 12.6 percent to $11.12, the AMEX Airline Index (.XAL) gained 6 percent. Trading in DAL options is heating up as well, with 35K calls and 7470 puts traded. Recent trades include a multi-exchange sweep of 8148 Mar 13 calls at the offer for 80 cents, which looks like an opening buyer. Average implied vols are moving as well, up to about 67 percent from 62.6 percent late yesterday.